Eager Explorer

When this creature enters, create a Map token.
(It's an artifact with "{1}, {t}, Sacrifice this artifact: Target creature you control explores. Activate only as a sorcery.")

Valiant — Whenever this creature becomes
the target of a spell or ability you control for the first time each turn, it 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 or put it
into your gr