Teemo

Forestwalk, Skulk (This creature can't be blocked by creatures with greater power.)
When I deal combat damage to a player, select a
card type. That player then reveals the top card
of their library. If that card matches the type selected, deal damage to that player equal to
that card's mana value.
Limit Break (Transform me when conditions are met.
I keep all counters when flipped.) An opponent
has taken 5+ damage after revealing a card from
the top of their deck.