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Extraplanar Lens (not at all a budget buy I know) is killer in mono decks with snow lands, and you've already got the snows

Lasting Fayth

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If you can build a deck around this effect, Life Equalizer can inflict 5000 or more burn damage in one go and although it can be awkward to setup, this card cannot be underestimated

Yan's deck is relatively easy to fight against at first, since it's mostly 1400 ATK monsters...until he pops out Pandemonium and one of the Zera monsters

Ill just copy all your spells for free