Glacial Chasm
A pillow card built entirely out of costs. The entry tax sacrifices a land, the static clause forbids your own creatures from attacking, and the cumulative upkeep means the price of staying alive climbs by two life every turn until it collapses on itself. What you buy with all of that is total damage immunity: not prevention with exceptions, not a shield against one source, but a blanket that stops every point of damage aimed at your face. That asymmetry is the whole design. Damage prevention had existed before, but tying it to a self-escalating clock turns immunity into a rented resource rather than a permanent state, and the rent compounds. The two-life payments are not the only meter; cumulative upkeep stacks counters, so by the time the chasm has been down a half-dozen turns you are paying enough to feel it, which forces you to crack it on your own terms before the math wins. The card reads as defensive, but its real function is to buy a fixed number of turns and dare you to use them. Combo decks that need to assemble something while ignoring the opponent's clock find the most honest use for it: every turn under the chasm is a turn the opponent cannot damage your life total, and the only question is whether you finish before the upkeep does.
