Cards like Underground Sea are nonbasic lands with two basic land types, in this case, being both an Island and a Swamp
1 Feed the Cycle
Ruthless Technomancer is an interesting combo because youll sacrifice your big Juri, generate lots of Treasure, cast it again, sacrifice all the Treasure for mana, and have your commander again ready to fight, almost as big as it was before
Concentrating Current can take advantage of Monsters with high Defense Points, and turn them into behemoths capable of winning the duel in just one attack
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With them, duels get a more action-packed edge to them, as monsters fight it out on the battlefield