Brainstorm

(T: Add G.)

(T: Add R.)

When this creature enters, investigate. (Create a Clue token. It's an artifact with "2, Sacrifice this token: Draw a card.")

Master of Etherium's power and toughness are each equal to the number of artifacts you control. Other artifact creatures you control get +1/+1.

Dark Depths enters with ten ice counters on it. 3: Remove an ice counter from Dark Depths. When Dark Depths has no ice counters on it, sacrifice it. If you do, create Marit Lage, a legendary 20/20 black Avatar creature token with flying and indestructible.

Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

T: Add G. Ferocious — T: Add GG. Activate only if you control a creature with power 4 or greater.

Morbid — At the beginning of each end step, if a creature died this turn, you may draw a card.