Lady Hummingbird

{t}: Lady Hummingbird deals 1 damage to target attacking or blocking creature.
Play with the top card your library revealed. As long as the top card of your library is black or a Swamp, Lady Hummingbird has Deathtouch.
All In - At the beginning of combat, if you control no untapped lands, you may put the top card of your library to your graveyard.