Portal of Inquisitive Souls

{x}{x}{g}, {t}: Tap X untapped creatures you control. Each of those creatures explores. (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 the creature, then put
the card back or put it into your graveyard.)
"To what undiscovered wonders will this portal
lead us?"