
Creatures you control gain shroud until end of turn. (They can't be the targets of spells or abilities.)
Tortoise Formation has 1 printing, first in Shards of Alara (2008). EDHREC ranks it #24,357 among Commander cards. It appears most in Archelos, Lagoon Mystic decks (483 on EDHREC).
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.