Lost Treekin

When Lost Treekin enters the battlefield, 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 graveyard.)
When Lost Treekin dies, create X 1/1 green
Saproling creature tokens, where X is the
number of +1/+1 counters on Lost Treekin.