Clara Waters, Stargazer

When Clara Waters, Stargazer 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.)
Whenever you explore and reveal a land card,
Clara Waters, Stargazer explores again.
Granny Waters is the invaluable astronomer for
Phoenix Team SG-13.