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10 Falling Down Falling Down has an effect that lets you steal an opponent's monster so long as you have an Archfiend card on the field, and while you do lose 800 life points during your opponent's standby phase, this cost is irrelevant when you can steal a boss monster

Change it to face-down Defence Position

Its a small comfort for Blue players

You can only use this effect of Suanni, Fire of the Yang Zing once per turn

What all this means is simple: if you can cast a card that costs the number of lands you have on the battlefield every turn of the game, you're going to be playing the strongest card you can each turn