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So in a four player commander game, one upkeep trigger of Palace Siege reduces the cost of all of your spells by a whooping six mana, turning huge demons, dragons, and eldrazi into very low costed threats

As long as this card Special Summoned by this effect is face-up on the field, you can only Special Summon Fiend monsters from the Extra Deck

2.4.6.8.13.17.22.25.26.35 10 units of the above

When you do so this way, if your opponent controls a monster, you can Normal Summon a Level 5 or higher monster without Tributing

If you play it in Red/Green, where you have access to a ton of mana and are packing some heavy critters, the right three cards in the graveyard option can win you the game, and in your hand can also win you the game