Avitus, Wyvern Lord

Flying, Shroud, Haste
When Avitus, Wyvern Lord enters the battlefield, all creatures you control gain +2/+2 and haste until end of turn. All other creatures that attack upon Avitus, Wyvern Lord entering the battlefield must then be sacrificed at the end of your turn.
{r/w}{r/w}: Avitus, Wyvern Lord gains +2/+0 until end of turn