Dora, the Explora

Dora, the Explora's Toughness is equal to the
number of lands you control.
When Dora enters the battlefield, create Boots,
a legendary 3/3 white monkey creature token.
Whenever Dora attacks, she 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 graveyard.)