Christmas Tree

When Christmas Tree enters the battlefield, put
twelve day counters on it. Then look at the top
6 cards of your library, put up to 3 cards under Christmas Tree (facedown). Exile the rest.
At the beginning of your end step,
remove a day counter from Christmas Tree.
{r}{g}{g/w},{t}: Remove a day counter from Christmas
Tree.
If there are no counters on Christmas Tree, exile it
and play all cards under it
without paying mana costs.