Tempting Puzzle Orb

Untap this card at the start of each player's upkeep.
Any player may use the effects of this card. Players
may only use the effects of this card on their turn.
{t}, Roll a d20.
1-4 | Spells cost {2} more to play this turn.
5-8 | Spells cost {1} more to play this turn.
9-12 | Draw 1 card, then discard 1 card.
13-16 | Spells cost {1} less to play this turn.
17-20 | Spells cost {2} less to play this turn.
If results of 1 or 20 are rolled, roll another d20.