Alastrous the Rekindled

Flying, Lifelink
When Alastrous the Rekindled enters the battlefield, Reveal the top X+3 cards of your
library. An opponent separates those cards into
two piles. Put one pile into your hand and the
other into your graveyard.
{3}{p/w}: Exile another target creature, then return it
to the battlefield tapped under its owners control.
{4}{w}{u}{b}, Exile 4 cards from your hand, Sacrifice
a Plains, Swamp, and Island: Transform