Raptor Raider

When Raptor Raider enters the battlefield and whenever another creature you control explores, Raptor Raider 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 this creature, then put the card back on top or into your graveyard).
"Why bother with horses, when your mount can be a man-eating slaughter machine ? "
- Jailee of the Serpent Queen