+2: You may exile a land you control. If you do, you may draw a card and return target card from your graveyard to you hand.
-4: You gain an emblem with "On each postcombat main phase, Exile target land. If you controlled the land return it to the battlefield and put a loyalty counter on target Nahiri planeswalker. then return all exiled lands to its owners battlefield"
-X: you draw X cards for each Nahiri planeswalker you control. if X is 7 or more instead deal X damage to each other permanent and opponents instead.