Ikoria

Whenever you discard a card, you may pay
{r/w}. If you do, shuffle cards from your
graveyard into your library equal to the number
of creatures you control and put a flare counter
on Ikoria.
{4}{r}{w}: Ikoria deals X damage to target player,
and you gain X life, where X is the number of
flare counters on Ikoria.