When this creature enters, create X green Subroutine enchantment tokens named MOUNT with “Whenever this Subroutine runs, target creature you control gets +2/+2 until end of turn.”
Flying When this creature enters, you may pay {3}{U}. If you do, create two 1/1 blue Bird creature tokens with flying. Other creatures you control with flying get +1/+1.
As an additional cost to cast this spell, exile three or more creature cards with different names from your graveyard. Whenever this creature attacks, defending player chooses a card exiled with it. Put that card onto the battlefield under your control.