Offer Immortality

Two keywords, one target, and a combat step rewritten. The pairing is the whole trick: deathtouch means any amount of damage this creature deals is lethal, indestructible means no amount of damage it takes matters, so a blocker or attacker that used to trade or die instead kills everything it touches and walks away. That turns an ordinary body into a one-turn wall of teeth. Throw a 1/1 in front of the biggest creature on the board and the attacker is gone; leave it back on defense and the whole team declines to swing. It also bends removal math, since indestructible sidesteps the entire "destroy" and lethal-damage clause of most red and white answers, forcing an opponent toward exile, bounce, or sacrifice effects to break through. The instant timing is what makes the deathtouch line live: hold it until blockers are declared, then hand it to whichever creature is standing in the way. The ceiling has hard walls, though: it guards a single creature, the buff evaporates at cleanup, and the board is back to normal by your opponent's next attack. This is a fight-winning trick dressed as a protection spell, at its best when the deathtouch edge and the indestructible shield point in the same direction on the same combat.