Zythis, The World Shell

{2}{g/u}{g/u}{g/u}{g/u}{t}: Choose any number of Turtles from
your graveyard and place them in a random order
on top of your deck. Draw a card.
{x}{g/u}{g/u}{t}: All turtles gain +X/+X Trample and Hexproof until the end of your turn. If X is 6
or more, they gain Lifelink as well. If X is 10 or
more, they gain Indestructible as well.
As Long As Zythis, The World Shell remains untapped, Turtles you control gain +3/+5 and
gain defender.