Gandalf, Party Guest 
Legendary Creature — Avatar Wizard
$1.60 #15316 0.32 0.2 years
At the beginning of combat on your turn, you may cast an instant or sorcery spell with mana value X or less from your hand without paying its mana cost, where X is twice the number of legendary Wizards you control.
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Cards similar to Gandalf, Party Guest 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.
Baral and Kari Zev76%
$0.26↓#7233↑0.13↓3.5 years↑
"Whenever you cast your first instant or sorcery spell each turn, you may cast a spell with lesser mana value that shares a card type with it from your hand without paying its mana cost. If you don't, create First Mate Ragavan, a legendary 2/1 red Monkey Pirate creature token. It gains haste until end of turn."
Zaffai and the Tempests76%
$0.21↓#12086↑0.260.5 years
"Once during each of your turns, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Sram's Expertise73%
$0.61↓#6911↑0.17↓9.7 years↑
"You may cast a spell with mana value 3 or less from your hand without paying its mana cost."
Glamdring72%
$2.27↑#5536↑0.313.3 years↑
"Whenever equipped creature deals combat damage to a player, you may cast an instant or sorcery spell from your hand with mana value less than or equal to that damage without paying its mana cost."
Founding the Third Path72%
$0.26↓#142050.12↓4.1 years↑
"You may cast an instant or sorcery spell with mana value 1 or 2 from your hand without paying its mana cost."
Umara Mystic72%
$0.17↓#20771↓0.00↓6.1 years↑
"Whenever you cast an instant, sorcery, or Wizard spell, this creature gets +2/+0 until end of turn."
Omnispell Adept72%
$0.22↓#19367↓0.00↓8.0 years↑
"
, 
: You may cast an instant or sorcery spell from your hand without paying its mana cost."
, : You may cast an instant or sorcery spell from your hand without paying its mana cost."
Yahenni's Expertise71%
$0.38↓#8753↑0.259.7 years↑
"You may cast a spell with mana value 3 or less from your hand without paying its mana cost."
Adeliz, the Cinder Wind70%
$0.28↓#10980↑0.22↓8.5 years↑
"Whenever you cast an instant or sorcery spell, Wizards you control get +1/+1 until end of turn."
Master of Winds70%
$0.21↓#20747↓0.12↓6.1 years↑
"Whenever you cast an instant, sorcery, or Wizard spell, you may have this creature's base power and toughness become 4/1 or 1/4 until end of turn."
Tetsuo, Imperial Champion70%
$0.42↓#175990.06↓4.1 years↑
"• You may cast an instant or sorcery spell from your hand with mana value less than or equal to the greatest mana value among Equipment attached to this card without paying its mana cost."
Invoke Calamity70%
$0.41↓#4100↑0.404.7 years↑
"You may cast up to two instant and/or sorcery spells with total mana value 6 or less from your graveyard and/or hand without paying their mana costs. If those spells would be put into your graveyard, exile them instead. Exile this card."