Join Shields

The trick here is the untap clause, not the protection. Mass hexproof-and-indestructible reads like a fog or a combo-protection blanket, an effect that shields a board through removal or a wrath cast in response. But Join Shields untaps everything first, and that one word reframes the whole spell: it is a combat instant that wants you tapped out and committed. Swing with the team, let the opponent declare blockers and reach for their removal, then untap all your attackers (now immune to the destroy and the targeted spell they were counting on) and leave them standing to block on the crackback. The protection is what survives the turn; the untap is what wins it. The cost is the real constraint. At five mana with two color requirements, this is not a reactive safety net held up cheaply; it is a spell a board-centric Selesnya deck pays full price for to turn one good attack into a swing that does not trade. That pulls it toward go-wide token strategies with enough bodies on the table to make a board-wide untap matter, where a single instant can blank a removal-and-block plan and keep the whole team available on both ends of the turn.