Basique Island

(Basique Island isn't a spell, it's affected by summoning sickness, and it has "{t}: Add {u}.")

{t}: Pose a riddle. Any opponent who answers correctly may draw a card. Then you draw a card.

Basique Island can be your commander. (It has no
mana cost. The "commander tax" doesn't apply to it. For purposes of color identity, treat it as if it has a
mana cost of {1}{u}.)