The great unknown

The great unknown can be your commander.
The great unknown enters with x unknown
counters on it.
{1}{t}: Add one mana of any colour.
{5}{t}: Add {w}{u}{b}{r}{g}.
{t}: Thr great unknown becomes a creature with
x/x with unblockable, where x is the amount of unknown counters on it.
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You cannot expect the unexpected, the unknown, or the
great unknown.