Skithiryx, the Blight Dragon [The List] DP42 It operates on necessity

It operates on necessity

Set: Dungeons & Dragons: Adventures in the Forgotten Realms Art Series Type: Card // Card Rarity: Common Small humanoid (kobold)

and you may spend mana as though it were mana of any color to cast them

At the beginning of each opponent's upkeep

Set: Sun & Moon: Ultra Prism Type: Supporter Rarity: Ultra Rare

Skithiryx, the Blight Dragon [The List] DP42 It operates on necessitySet: The List Type: Legendary Creature Phyrexian Dragon Skeleton Rarity: Mythic Cost: {3}{B}{B} Flying Infect (This creature deals damage to creatures in the form of 1 1 counters and to players in the form of poison counters.) {B}: Skithiryx, the Blight Dragon gains haste until end of turn. {B}{B}: Regenerate Skithiryx.