Doubling Cube [The List]

Doubling Cube [The List]Set: The List Type: Artifact Rarity: Rare Cost: {2} {3}, {T}: Double the amount of each type of unspent mana you have. The cube's surface is pockmarked with jagged runes that seem to shift when unobserved.

(They can't be blocked as long as defending player controls a Swamp

Set: Collectors’ Edition Type: Land — Mountain Forest Rarity: Rare ({T}: Add {R} or {G}

Set: Fourth Edition Type: Land Rarity: Uncommon {T}: Add {C}

Each land with an activated ability that isn't a mana ability doesn't untap during its controller's untap step

Set: Dragons of Tarkir Type: Legendary Creature — Elder Dragon Rarity: Mythic Cost: {4}{B}{R} Flying

Set: Duel Terminal - Preview Card type: Tuner Monster Rarity: Rare Attack: 300 Defense: 100 If this card is sent to the Graveyard for the Synchro Summon of a "Nitro" Synchro Monster

you can remove from play 1 "Nordic Beast" Tuner monster from your Graveyard to Special Summon this card from the Graveyard

Increase the ATK of this monster by 300 points for each Spell Counter on this card

Set: Limited Edition Alpha Type: Instant Rarity: Common Cost: {W} Choose one —

if it was a Flip monster

This effect can't reduce the mana in that cost to less than one mana

You can only use this effect of "Ursarctic Septentrion" once per turn