This means if we're going to play Invasion of Karsus over other competing options like Brotherhood's End and Anger of the Gods, the backside is going to have to make up for this inefficiency
Zanarkand, Ancient Metropolis // Lasting Fayth Land Town // Sorcery Adventure Zanarkand, Ancient Metropolis Land Town This land enters tapped
As for the others, a doubling of mana cost would still leave you with absurd cards, UU - Draw 3
Mishra's Command is an X spell with the ability to shoot a planeswalker for X, a creature for X, a discard up to X cards and draw that many or pump a dork and give it haste
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Green has no shortage of cards that can untap lands, so Gaea's Cradle can be untapped for absurd amounts of mana