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Soulbond (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.) As long as Thundering Mightmare is paired with another creature, each of those creatures has "Whenever an opponent casts a spell, put a +1/+1 counter on this creature."
Abilities, attacks, weakness & resistance
Other cards from Magic Online Promos
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Thundering Mightmare is a green Creature — Horse Spirit promo from Magic Online Promos (collector number 95413). It has Soulbond and, while paired, grants both paired creatures a triggered ability that places a +1/+1 counter on them whenever an opponent casts a spell. In decks it can serve as a incremental counter engine and pairs well with other creatures that survive to capitalize on repeated triggers.
Catalog pricing data as of 21 Apr 2026, 09:37