Survival War

Challenge 4 (Each player reveals cards from the top
of their libraries until up to four creatures are revealed,
then put on the battlefield all creatures revealed this
way under their owners control.)
Creatures gain haste, deathtouch and "{t}: This creature deals 1 damage to any target" until end
of turn. Untap all lands, they gain "{t}: Sacrifice
two lands, return target creature from your
graveyard to the battlefield under your control".
Exile Survival War.