Igurueibisu

Flying, First Strike
Whenever this creature attacks each Bird Wyvern
you control gains +1/+1 for each Bird Wyvern
you control.
Whenever a Bird Wyvern dies put a +1/+1
counter on each Bird Wyvern you control.
Whenever this creature blocks target Bird
Wyvern gains Flying and First Strike until
the end of your next turn.