Helvault

You gain 2 life for each card in your graveyard, then shuffle your graveyard into your library.

Creatures you control get +0/+4 until end of turn.

Creatures you control get +1/+1 until end of turn. Fateful hour — If you have 5 or less life, those creatures gain indestructible until end of turn. (Damage and effects that say "destroy" don't destroy them.)

Enchant creature 1: Tap enchanted creature.

Enchant player Enchanted player can't cast more than one spell each turn.

Lifelink (Damage dealt by this creature also causes you to gain that much life.) When this creature dies, create a 1/1 white Spirit creature token with flying.

Target permanent you control gains protection from the color of your choice until end of turn. Fateful hour — If you have 5 or less life, instead you and each permanent you control gain protection from the color of your choice until end of turn.

Create two 1/1 white Human creature tokens. Fateful hour — If you have 5 or less life, create five of those tokens instead.