At the beginning of combat on your turn, up to one target land you control becomes an X/X green and blue Bird creature with flying (This creature can't be blocked except by creatures with flying or reach.)
and haste (This creature can attack, and as soon as it comes under your control.)
until end of turn, where X is the number of cards in your hand. It's still a land.
Whenever a land creature you control deals combat damage to a player, draw a card.