Selvala, Heart of the Wilds 246 (Commander: Modern Horizons 3)

Whenever another creature enters, its controller may draw a card if its power is greater than each other creature's power. {G}, {T}: Add X mana in any combination of colors, where X is the greatest power among creatures you control.

NM - $6.10
LP - $3.10
MP - $3.70
HP - $2.20
DMG - $2.20