Dark Blade

First strike, deathtouch, menace

Whenever this creature deals combat damage to a player, untap it, then search your graveyard, hand and/or library for a Dragon Mount, put that creature onto the battlefield, that creature gains haste until end of turn. If you searched your library this way, shuffle.

This creature saddles Dragon Mounts as though its power were 10 greater.
Whenever this creature saddles a Dragon Mount. There is an additional combat phase after this one.