Arena of Glory 351 (Modern Horizons 3)

This land enters tapped unless you control a Mountain. {T}: Add {R}. {R}, {T}, Exert this land: Add {R}{R}. If that mana is spent on a creature spell, it gains haste until end of turn. (An exerted permanent won't untap during your next untap step.)

NM - $24.80
LP - $19.80
MP - $14.90
HP - $9.90
DMG - $5.00