Clawber the Spark Stealer

Whenever a player casts an instant or sorcery, place X +1/+1 counters on a target artifact equal to the mana cost of the spell.

Whenever Clawber the Spark Stealer blocks a creature, select a instant or sorcery from the attacking player's graveyard. Until your next end step, Clawber's controler may cast that spell using mana of any color.

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