Sen, Fist of the Five Suns

Other Myr you control get +1/+1
Tap an untapped Myr you control: Add one
mana of any color. Spend this mana only to cast
Myr spell or activate abilities of Myr.
{w}{u}{b}{r}{g}: Search your library and/or
graveyard for Myr creature card, revel it,
and put in onto the battlefield. If you search
your library this way, shuffle it.