Delvefall
Geistflame Reservoir

Geistflame Reservoir {2}{R}

Artifact

Whenever you cast an instant or sorcery spell, put a charge counter on this artifact.
{1}{R}, {T}, Remove any number of charge counters from this artifact: It deals that much damage to any target.
{1}{R}, {T}: Exile the top card of your library. You may play that card this turn.

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only legendary creatures, the cards that can lead a commander deck

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Cards that do something similar expected a card that isn't here?

Primal Amulet // Primal Wellspring
Primal Amulet // Primal Wellspring 98%
$13.51#2071
"Whenever you cast an instant or sorcery spell, put a charge counter on this artifact. Then if there are four or more charge counters on it, you may remove those counters and transform it."
Cori Mountain Monastery
Cori Mountain Monastery 98%
$1.19#3718
"{3}{R}, {T}: Exile the top card of your library. Until the end of your next turn, you may play that card."
Adaptive Training Post
Adaptive Training Post 95%
$0.24#8625
"Whenever you cast an instant or sorcery spell, if this artifact has fewer than three charge counters on it, put a charge counter on it."
Hidetsugu, Devouring Chaos
Hidetsugu, Devouring Chaos 90%
$0.25#10471
"{2}{R}, {T}: Exile the top card of your library. You may play that card this turn. When you exile a nonland card this way, this card deals damage equal to the exiled card's mana value to any target."
Fires of Mount Doom
Fires of Mount Doom 90%
$1.98#13601
"{2}{R}: Exile the top card of your library. You may play that card this turn. When you play a card this way, this card deals 2 damage to each player."
Firemind's Research
Firemind's Research 87%
$0.31#12997
"Whenever you cast an instant or sorcery spell, put a charge counter on this enchantment."
+1 more matching line
Diary of Dreams
Diary of Dreams 86%
$0.21#11492
"Whenever you cast an instant or sorcery spell, put a page counter on this artifact."
Spell Satchel
Spell Satchel 83%
$0.13#14253
"Whenever you cast or copy an instant or sorcery spell, put a book counter on this artifact."
Geometric Nexus
Geometric Nexus 82%
$0.34#14833
"Whenever a player casts an instant or sorcery spell, put a number of charge counters on this artifact equal to that spell's mana value."
Sphinx-Bone Wand
Sphinx-Bone Wand 82%
$0.43#14855
"Whenever you cast an instant or sorcery spell, you may put a charge counter on this artifact. If you do, this artifact deals damage equal to the number of charge counters on it to any target."
Surrakar Spellblade
Surrakar Spellblade 82%
$0.32#16470
"Whenever you cast an instant or sorcery spell, you may put a charge counter on this creature."
Jin-Gitaxias, Progress Tyrant
Jin-Gitaxias, Progress Tyrant 82%
$9.58#1699
"Whenever an opponent casts an artifact, instant, or sorcery spell, counter that spell. This ability triggers only once each turn."
Mindsplice Apparatus
Mindsplice Apparatus 80%
$1.02#2797
"Instant and sorcery spells you cast cost {1} less to cast for each oil counter on this artifact."