Succession of the Chosen

Succession of the Chosen can be your
commander.
Chosen One (When you cast this, search your library
for a creature with mana cost X or less, where X is the
amount of mana spent to cast this. Put that creature
into play. This card becomes an aura attached to that creature.)
{w}: enchanted creature gains double strike until
end of turn.
{g}: enchanted creature gains trample until end of
turn.