Delvefall
The Twelfth Doctor

The Twelfth Doctor {3}{U}{R}

Legendary Creature — Time Lord Doctor

The first spell you cast from anywhere other than your hand each turn has demonstrate. (When you cast that spell, you may copy it. If you do, choose an opponent to also copy it. A copy of a permanent spell becomes a token.)
Whenever you copy a spell, put a +1/+1 counter on The Twelfth Doctor.

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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?

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+1 more matching line
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Yawgmoth's Agenda
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Moderation
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Liberator, Urza's Battlethopter
Liberator, Urza's Battlethopter 81%
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"Whenever you cast a spell, if the amount of mana spent to cast that spell is greater than this card's power, put a +1/+1 counter on this card."
Moonveil Regent
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"Whenever you cast a spell, you may discard your hand. If you do, draw a card for each of that spell's colors."
Savvy Trader
Savvy Trader 80%
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"Spells you cast from anywhere other than your hand cost {1} less to cast."
Once Upon a Time
Once Upon a Time 80%
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"If this spell is the first spell you've cast this game, you may cast it without paying its mana cost."