+Shrike (5)
Flying
Evershrike gets +2/+2 for each Aura attached to it.
: Return Evershrike from your graveyard to the battlefield. You may put an Aura card with mana value X or less from your hand onto the battlefield attached to it. If you don't, exile Evershrike.
Whenever Impaler Shrike deals combat damage to a player, you may sacrifice it. If you do, draw three cards.
Flying, double strike, vigilance
Tribute 2 (As this creature enters, an opponent of your choice may put two +1/+1 counters on it.)
When Shrike Harpy enters, if tribute wasn't paid, target opponent sacrifices a creature of their choice.
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
Gatherer works better in the Companion app!