+lunk (6)
Target creature gets -X/-X until end of turn, where X is 7 minus the number of cards in that creature's controller's hand.
Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)
When Jadelight Spelunker enters the battlefield, it explores X times. (To 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 that creature, then put the card back or put it into your graveyard.)
Whenever Lunk Errant attacks alone, it gets +1/+1 and gains trample until end of turn.
Mogg Flunkies can't attack or block alone.
When Spelunking enters the battlefield, draw a card, then you may put a land card from your hand onto the battlefield. If you put a Cave onto the battlefield this way, you gain 4 life.
Lands you control enter the battlefield untapped.
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