mtg m15 promo cards M15: Act on Impulse : r/magicTCG Duels of the Planeswalkers 2015

Either way, I like this kind of effect where maybe your opponents are weary of blocking an attacker with their beefy blocker

Elemental skips your opponents untap step when its turned face-up, but 7 mana is a lot and you only get one shot at it

Let's lump them all together out of respect and get to the real chonkers: Polar Kraken Denizen of the Deep Spawnsire of Ulamog Darksteel Colossus Inkwell Leviathan Titanoth Rex It That Betrays Blightsteel Colossus #26

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It was released in Ikoria: Lair of Behemoths and illustrated by Antonio Jos Manzanedo