Cloud Key [The List]Set: The List Type: Artifact Rarity: Rare Cost: {3} As Cloud Key enters the battlefield, choose artifact, creature, enchantment, instant, or sorcery. Spells you cast of the chosen type cost {1} less to cast. The musical sound of its turning triggers the tumblers of revelation.

and artifacts

Set: Commander 2021 Type: Sorcery Rarity: Rare Cost: {5}{R}{W} Return all artifact cards from your graveyard to the battlefield

(Each of those players gets one life total back

Set: Dragons of Tarkir Type: Sorcery Rarity: Rare Cost: {X}{B}{B} Target player draws X cards and loses X life

Return Lochmere Serpent from your graveyard to your hand

Set: Modern Masters Type: Creature — Faerie Rogue Rarity: Common Cost: {1}{B}{B} Flying

create a token that's a copy of Biowaste Blob

Bird creatures get +1/+1 for each feather counter on Soulcatchers' Aerie

Set: Modern Masters 2015 Type: Creature — Human Wizard Rarity: Rare Cost: {1}{U}{B} Fear (This creature can't be blocked except by artifact creatures and/or black creatures

"A skilled decoy can throw your enemies off your trail

Set: Magic 2014 Type: Creature — Dragon Rarity: Mythic Cost: {2}{R}{R}{R} Flying

Then put the exiled instant and sorcery cards that weren't cast this way into your hand and the rest on the bottom of your library in a random order