Cup of the King of Tavernopoli

Whenever you draw a card put 1 counter on this artifact.
Unspent colored mana up to the number of counters on this card is not lost at the end of any phase.
If this card would leave the field you can remove 2 counters from this card and untap it instead.
{1}{t}: draw a card, then discard a card.
{3}{t}: the next spell is cast twice.
{7}{t}: set your health back to 20.