Iron-Shield Elf

The whole design lives in the gap between what indestructible protects against and what still kills a 3/1. Discard a card, and the body shrugs off destroy-effects and lethal damage until end of turn, then taps as a rider on that same activation. Because the tap is part of the effect and not part of the cost, nothing stops you from firing this while the creature is already tapped and attacking: swing in, and if the crack-back is a removal spell or a combat blowout, pitch a card to walk it through. The 1 toughness is the honest catch. The reminder text spells out what the ability quietly does not cover: a minus-one-toughness effect, a bounce-and-shrink, or anything that sets toughness to 0 still buries it, and once it taps itself it becomes a target for effects that punish tapped permanents. The activation cost points the whole card at a specific kind of shell. A discard is dead weight in a deck that wants to hoard its hand, but it is fuel in one built to fill a graveyard: madness, delirium, threshold, escape, any engine that would rather see cards in the yard than in hand. Read against that backdrop, this is a warrior built to survive a sweeper or a burn spell for a turn, paying in the same resource its graveyard deck was already spending on purpose.