Adaptive Training Post 

Artifact
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.
Remove three charge counters from this artifact: When you next cast an instant or sorcery spell this turn, copy it and you may choose new targets for the copy.
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Cards that do something similar expected a card that isn't here?
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Primal Amulet // Primal Wellspring 96%
$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."
Geistflame Reservoir 95%
$0.18#16934
"Whenever you cast an instant or sorcery spell, put a charge counter on this artifact."
Golem Foundry 90%
$0.30#5783
"Remove three charge counters from this artifact: Create a 3/3 colorless Golem artifact creature token."
+1 more matching line
Chimeric Egg 89%
$0.24#23112
"Remove three charge counters from this artifact: This artifact becomes a 6/6 Construct artifact creature with trample until end of turn."
+1 more matching line
Firemind's Research 88%
$0.31#12997
"Whenever you cast an instant or sorcery spell, put a charge counter on this enchantment."
Diary of Dreams 86%
$0.21#11492
"Whenever you cast an instant or sorcery spell, put a page counter on this artifact."
Surrakar Spellblade 85%
$0.32#16470
"Whenever you cast an instant or sorcery spell, you may put a charge counter on this creature."
Overmaster 85%
$2.99#3095
"The next instant or sorcery spell you cast this turn can't be countered."
Spell Satchel 85%
$0.13#14253
"Whenever you cast or copy an instant or sorcery spell, put a book counter on this artifact."
+1 more matching line
Geometric Nexus 83%
$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."
+1 more matching line
Jin-Gitaxias, Progress Tyrant 83%
$9.58#1699
"Whenever an opponent casts an artifact, instant, or sorcery spell, counter that spell. This ability triggers only once each turn."
Academy Wall 83%
$0.27#13132
"Whenever you cast an instant or sorcery spell, you may draw a card. If you do, discard a card. This ability triggers only once each turn."
Mizzix of the Izmagnus 82%
$0.80#6271
"Instant and sorcery spells you cast cost {1} less to cast for each experience counter you have."
Sphinx of the Final Word 82%
$0.25#10176
"Instant and sorcery spells you control can't be countered."
Lier, Disciple of the Drowned 81%
$0.43#2209
"Each instant and sorcery card in your graveyard has flashback. The flashback cost is equal to that card's mana cost."
Baral and Kari Zev 81%
$0.24#6953
"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."
Taigam, Ojutai Master 81%
$1.00#9267
"Whenever you cast an instant or sorcery spell from your hand, if this card attacked this turn, that spell gains rebound."
Veyran, Voice of Duality 81%
$1.36#790
"If you casting or copying an instant or sorcery spell causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time."
Archmage Emeritus 81%
$0.51#258
"Whenever you cast or copy an instant or sorcery spell, draw a card."