Javad, Ondu Relic Drifter

Islandwalk, swampwalk
Whenever Javad deals combat damage to a
player, exile target artifact, enchantment, or land
card from a graveyard. You may create copies of
cards exiled this way, and spend mana as though
it were mana of any type to cast them.
At the beginning of your upkeep, for each card
exiled by Javad, put it into its owner's graveyard
unless you pay {u/b}{u/b}.