Doubling Season [Modern Masters] Premodern where X is the number

where X is the number of lands you control at that time

Set: Limited Edition Beta Type: Artifact Uncommon Cost: {4} {3}

If you control an Urza's Power-Plant and an Urza's Tower

Set: Ravnica: City of Guilds Type: Land — Mountain Plains Rare Cost: ({T}: Add {R} or {W}

Set: Unlimited Edition Type: Creature — Human Knight Rare Cost: {2}{W}{W} {W}{W}

Doubling Season [Modern Masters] Premodern where X is the numberSet: Modern Masters Type: Enchantment Rare Cost: {4}{G} If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead. If an effect would put one or more counters on a permanent you control, it puts twice that many of those counters on that permanent instead.