Holly Blue, Taskmaster

Gem creature cards you own that aren't on the
battlefield have authorize(This has flash as long as
you control your commander or a planeswalker.).
When a Gem enters the battlefield under your
control, you may pay {w}, {b} or both. If you paid
{w}, tap that Gem and you gain life equal to its
toughness. If you paid {b}, that Gem gets -2/-2
until your next turn and you draw a card.