Tortoise Formation 
Instant
Creatures you control gain shroud until end of turn. (They can't be the targets of spells or abilities.)
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL
Instant
Creatures you control gain shroud until end of turn. (They can't be the targets of spells or abilities.)