Aleton, the Unhindered

Aleton, the Unhindered cant be blocked.
Whenever Aleton deals combat damage to a
player, you may pay {1}{u}. If you do, that player reveals their hand. You may then choose and
exile a card from that players hand.
{t}, discard a card: Until end of turn, you may
cast spells exiled with Aleton. You may spend
mana as though it were of any colour to cast
spells exiled with Aleton.