Dratini

When Dratini enters the battlefield, tap target creature it doesn't untap on the next untap step.
When Dratini becomes blocked, attacking creature doesn't untap on the next untap step.
Outrage - Sacrifice Dratini. Add {w/u}{w/u}. Scry 2.
Evolve {u}{u}{w}{w}{t} Sacrifice Dratini. Search your library for a card named "Dragonair" and put it
on the battlefield tapped.