Leviathan

Flying, first strike, vigilance, trample, haste, protection from black and from red

Sacrifice an enchantment: This creature gets +2/+2 until end of turn.

Lands you control are Plains. Nonland permanents you control are white. The same is true for spells you control and nonland cards you own that aren't on the battlefield. You may spend white mana as though it were mana of any color. You may spend other mana only as though it were colorless mana.

Enchant land Enchanted land has indestructible and can't be enchanted by other Auras.

When this creature blocks, at end of combat, destroy it and all creatures it blocked this turn. 5, T: Search your library for a Rebel permanent card with mana value 4 or less, put it onto the battlefield, then shuffle.

Destroy target artifact or enchantment.

Play with your hand revealed. If you would draw a card, reveal the top card of your library instead. If it's a creature card, put it into your graveyard. Otherwise, draw a card. Whenever a creature is put into your graveyard from the battlefield, return it to your hand.

Whenever a Sliver deals damage, its controller gains that much life.