Thanos, The Conquerer

+2: target creature you control gains indestructible, hexproof, double strike, fear, flying, trample, deathtouch and lifelink until end of turn
-5: creatures your opponents control get -X/-X until end of turn, where X is the number of loyalty counters on Thanos, The Conquerer
-20: each player loses half their life, exiles half their library, sacrifices half of all permanents they control and then exiles half their graveyard