Gemdelver Sage

When Gemdelver Sage enters the battlefield, create a Gem Artifact Token.
{t}: Create a Gem Artifact Token.
Whenever you sacrifice a Gem Artifact Token, you may have Gemdelver Sage deal 1 damage to any target and you gain 1 life.
{t}: Sacrifice an artifact: Look at the top three cards
of your library. You may reveal a land or artifact
card from among them and put it into your hand.
—"Gem light is the life of our lands."