Lord Unuthien, the Soulbound

Whenever a creature dies, exile it. If you do, put
a +1/+1 counter on Lord Unuthien.
{4}{b}: Until end of turn, you may cast cards
exiled with Lord Unuthien by removing a +1/+1
counter from Lord Unuthien in addition to
paying those spells' mana costs.
WE ARE ETERNAL.WE ARE INFINITE. WE
ARE ALL.