Stronghold Gambit [Nemesis] Ogre Demon you may pay {0} rather

you may pay {0} rather than pay the mana cost for a spell you cast with mana value X or less

Set: Collectors' Edition Type: Instant Rarity: Rare Cost: {2}{U} Tap all lands target player controls and that player loses all unspent mana

up to one target creature gets -3/-0

It doesn't make them easier to control

Stronghold Gambit [Nemesis] Ogre Demon you may pay {0} ratherSet: Nemesis Type: Sorcery Rarity: Rare Cost: {1}{R} Each player chooses a card in their hand. Then each player reveals their chosen card. The owner of each creature card revealed this way with the lowest converted mana cost puts it onto the battlefield.