Teysa, Syndicate Baroness

Whenever Teysa, Syndicate Baroness attacks or blocks, create X 1/1 white and black Spirit
creature tokens with flying, where X is the
number of cards you own in exile. If three or
more tokens are created this way, you gain 1 life.
Vigilance
{b}, Pay 3 life: Exile the top card of your library.
You may cast that card until end of turn.