A famous example of this strategy is found in "Vennominaga the Deity of Poisonous Snakes", which, while difficult to get onto the field, is invulnerable to all other card effects and can revive itself if destroyed by battle, and provides one of the game's few alternate win conditions
But Celestine fits that bill
Is Tribal a Type of Permanent
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The indestructible ability is pretty sweet and will make Tyvar difficult to deal with
Lhurgoyf's power is equal to the number of creature cards in all graveyards and its toughness is equal to that number plus 1