Helvault

Exile all other spells and counter all abilities.

Target creature gets +2/+2 until end of turn. If you control an Equipment, create a 1/1 white Human Soldier creature token.

Whenever this creature or another creature dies, target player loses 1 life and you gain 1 life.

Return target instant or sorcery card from your graveyard to your hand. Flashback 2R (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Whenever one or more other creatures die, draw a card. This ability triggers only once each turn.

When this creature dies, draw a card.

Whenever a nontoken creature you control dies, investigate. (Create a Clue token. It's an artifact with "2, Sacrifice this token: Draw a card.") Whenever you sacrifice a Clue, create a 1/1 white Human Soldier creature token.

Alchemist's Greeting deals 4 damage to target creature. Madness 1R (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)