mtg deep clue sea commander deck Got two of these cards in the precon : r/magicTCG Murders at Karlov Manor Commander

As a deck, as you may have guessed from its name, it's all about counters and spreading them across all of your creatures

There are some rules for decks, and the randomization of the cards won't guarantee they meet the rules

Archangel Avacyn If you just want to protect your creatures from opponents' threats, Archangel Avacyn is a 5-mana card that lets your party survive the likes of Wrath of God

Kellan, the Fae-Blooded Kellan, the Fae-Blooded is already Open the Armory before you even account for the creature half of this adventure

Even if Prismari dies on the spot, you already get some value

There are some more minor options in Red and Black utilizing more of a ritual-style ramp effect, but outright ramps is a bit more of a rarity, especially on ETB creatures