Aventurine of Stratagems

Aventurine enters the battlefield with a shield counter on it.

Whenever you roll one or more dice, instead roll that many plus one and ignore the lowest roll.

Whenever you roll one or more dice put a +1/+1 counter on Aventurine, and create a tapped treasure token.

{3}, {t}: Roll a D20. If the result is greater than this card's power or it's a 20, put a shield counter on a creature you control.