Conquest of Ongroch Keep

(As this Saga enters the battlefield and after your
draw step, add a lore counter. Sacrifice after III.)
I: Target opponent sacrifices 2 creatures.
II: Create 2 2/2 Spirit Knight tokens with
deathtouch.
III: Gain control of target nonbasic land. It
becomes a Legendary Swamp named Ongroch
Keep with {t}: Create a 2/2 Spirit Knight token
with deathtouch. That creature gains haste until
end of turn.