Bill Potts 

Legendary Creature — Human
$0.15 #22954 0.33 2.9 years
Whenever you cast an instant or sorcery spell that targets only Bill Potts or activate an ability that targets only Bill Potts, copy that spell or ability. You may choose new targets for the copy. This ability triggers only once each turn.
Doctor's companion (You can have two commanders if the other is the Doctor.)
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Cards similar to Bill Potts expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Reflective Golem96%
$0.09↓#238810.12↓5.4 years↑
"Whenever you cast an instant or sorcery spell that targets only this creature, you may pay
. If you do, copy that spell. You may choose new targets for the copy."
Beamsplitter Mage96%
$0.28↑#211070.06↓7.9 years↑
"Whenever you cast an instant or sorcery spell that targets only this creature, if you control one or more other creatures that spell could target, choose one of those creatures. Copy that spell. The copy targets the chosen creature."
Leyline of Resonance95%
$0.73↑#5344↑0.411.9 years
"Whenever you cast an instant or sorcery spell that targets only a single creature you control, copy that spell. You may choose new targets for the copy."
Zada, Hedron Grinder94%
$0.13↓#3402↑0.77↑10.9 years↑
"Whenever you cast an instant or sorcery spell that targets only this card, copy that spell for each other creature you control that the spell could target. Each copy targets a different one of those creatures."
Double Vision92%
$0.60↑#2730↑0.436.2 years↑
"Whenever you cast your first instant or sorcery spell each turn, copy that spell. You may choose new targets for the copy."
Swarm Intelligence92%
$0.36↑#4702↑0.379.1 years↑
"Whenever you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copy."
Mirari90%
$0.42↑#15206↑0.88↑24.9 years↑
"Whenever you cast an instant or sorcery spell, you may pay
. If you do, copy that spell. You may choose new targets for the copy."
Ink-Treader Nephilim90%
$6.40↑#193860.3320.6 years↑
"Whenever a player casts an instant or sorcery spell, if that spell targets only this creature, copy the spell for each other creature that spell could target. Each copy targets a different one of those creatures."
Mirrorwing Dragon88%
$0.30↑#8196↑0.14↓10.1 years↑
"Whenever a player casts an instant or sorcery spell that targets only this creature, that player copies that spell for each other creature they control that the spell could target. Each copy targets a different one of those creatures."
Riku of Two Reflections87%
$5.72↑#12137↑0.47↑15.2 years↑
"Whenever you cast an instant or sorcery spell, you may pay 
. If you do, copy that spell. You may choose new targets for the copy."
Exterminator Magmarch87%
$0.29↑#13923↑0.262.2 years
"Whenever you cast an instant or sorcery spell that targets only a single nonland permanent an opponent controls, if another opponent controls one or more nonland permanents that spell could target, choose one of those permanents. Copy that spell. The copy targets the chosen permanent."
Unbound Flourishing86%
$2.37↑#2637↑0.47↑7.2 years↑
"Whenever you cast an instant or sorcery spell or activate an ability, if that spell's mana cost or that ability's activation cost contains
, copy that spell or ability. You may choose new targets for the copy."
Cloven Casting86%
$0.25↑#223620.58↑17.3 years↑
"Whenever you cast a multicolored instant or sorcery spell, you may pay
. If you do, copy that spell. You may choose new targets for the copy."
Spinerock Tyrant86%
$1.47↑#9739↑0.00↓0.6 years↓
"Whenever you cast an instant or sorcery spell with a single target, you may copy it. If you do, those spells gain wither. You may choose new targets for the copy."
Fin Fang Foom84%
$0.35↑#207530.00↓0.2 years↓
"Whenever you cast an instant or sorcery spell that targets an artifact or land, copy that spell. You may choose new targets for the copy. Put two +1/+1 counters on this card."
Sevinne, the Chronoclasm84%
$0.25↑#202340.71↑7.0 years↑
"Whenever you cast your first instant or sorcery spell from your graveyard each turn, copy that spell. You may choose new targets for the copy."
Krark, the Thumbless84%
$1.98↑#3538↑0.71↑5.8 years↑
"Whenever you cast an instant or sorcery spell, flip a coin. If you lose the flip, return that spell to its owner's hand. If you win the flip, copy that spell, and you may choose new targets for the copy."
+1 more matching line
Aziza, Mage Tower Captain84%
$0.17↑#12687↑0.00↓0.4 years↓
"Whenever you cast an instant or sorcery spell, you may tap three untapped creatures you control. If you do, copy that spell. You may choose new targets for the copy."
Melek, Izzet Paragon83%
$0.19↑#7411↑0.3013.4 years↑
"Whenever you cast an instant or sorcery spell from your library, copy it. You may choose new targets for the copy."