Doubling Season [Commander Masters] Fate Reforged you may cast an artifact

you may cast an artifact spell from your hand or graveyard by paying life equal to its mana value rather than paying its mana cost

and farmers build secret passages to move about undetected by the dragon

Set: Platinum: Rising Rivals Type: Fighting Rarity: Holo Rare Retreat cost: Colorless

Set: Eternal Masters Type: Instant Rarity: Mythic Cost: {3}{U}{U} You may pay 1 life and exile a blue card from your hand rather than pay this spell's mana cost

Counter target spell

Doubling Season [Commander Masters] Fate Reforged you may cast an artifactSet: Commander Masters Type: Enchantment Rarity: Mythic 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.