Haste
{1}: This token can't be blocked this turn except by creatures with haste.
{2}, {T}, Sacrifice this token: You gain 3 life.
(This token's mana cost is {1}.)

{1}, {T}, Sacrifice this artifact: Target creature you control explores. Activate only as a sorcery. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then put the card back or put it into your graveyard.)