Aidar, Highborn Gaichanin

When Aidar enter the battlefield, search your library
for up to two Gaichanin cards, put them into your hand, then shuffle your library. At the beginning of your upkeep, if you have full Gai, choose one:
Creatures you control gains indestrictuble and
"This creature gets +1/+1 for each creature on the battlefield"
until your next turn.
Creatures you control gains hexproof and
"Whenever this creature attack or block,
draw a card" until your next turn.