Unifying Theory 

Enchantment
$0.43 #25217 0.12 24.9 years
Whenever a player casts a spell, that player may pay
. If the player does, they draw a card.
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"Whenever an opponent casts a spell, you may draw a card unless that player pays
."
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"Whenever a player casts a spell, they may pay
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"Whenever a player casts a spell, if it's not their turn, that player draws a card."
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"Whenever an opponent casts a noncreature spell, you may draw a card unless that player pays
."
Fecundity78%
$0.65↑#4992↑0.23↑27.9 years↑
"Whenever a creature dies, that creature's controller may draw a card."
Esper Sentinel78%
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"Whenever an opponent casts their first noncreature spell each turn, draw a card unless that player pays
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"Whenever a player plays a land, that player draws a card."
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"Whenever a player casts their first multicolored spell each turn, each other player draws a card."
Heartwood Storyteller77%
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"Whenever a player casts a noncreature spell, each of that player's opponents may draw a card."
Font of Mythos76%
$15.31↑#2161↑0.30↑17.6 years↓
"At the beginning of each player's draw step, that player draws two additional cards."
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"At the beginning of each player's draw step, that player draws an additional card."
Kami of the Crescent Moon76%
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"At the beginning of each player's draw step, that player draws an additional card."
Nether Void72%
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"Whenever a player casts a spell, counter it unless that player pays
."
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"At the beginning of each other player's draw step, that player draws an additional card."
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"
: Each player may draw a card, then each player who drew a card this way gains 1 life."
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"Whenever an opponent casts a spell that targets you or a creature you control, you may draw a card."