Explorer's League HQ

As long as Explorer's League HQ is fortified,
whenever a Vehicle you control attacks you may
have it explore. (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.)
Fortify {2} ({2}: Attach to target land you control.
Fortify only as a sorcery. This card enters the battlefield unattached and stays on the battlefield if
the land leaves.)