Wrexial, the Risen Deep

The evasion is not a probability; it is a guarantee against the exact decks worth attacking. Islandwalk and swampwalk make this Kraken flatly unblockable as long as the defender controls an Island or a Swamp, which is to say: unblockable against the blue-black control shells and reanimator piles whose graveyards are packed with the instants and sorceries you want to steal. When the 5/8 connects, the payoff is theft, not recursion. You cast a spell from the opponent's bin for free, and the exile rider is what separates this from a borrow: anything cast this way is exiled rather than returning to their graveyard, so a single hit can lift their countermagic, their board wipe, or their tutored finisher and deny them the chance to flash it back themselves. Each successful attack quietly thins the graveyard you are mining rather than refueling it for both players. The toughness is the unglamorous part that makes the rest functional: eight survives most of the combat and burn math that would otherwise stop a six-mana attacker from reliably getting in twice. This is the predatory inversion of effects that recur your own spells. Where Snapcaster Mage rents your graveyard, this annexes the opponent's, and the more spell-dense the table, the sharper the larceny becomes.