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If any one of those cards share a card type with the spell youre casting, you get a copy of your spell and your opponents each draw a card

P/T Set Number 234 Language Portugus Legal Formats Commander, Legacy, Modern, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Pioneer, Standard, Timeless Rulings (6/18/2021) Domain abilities count the number of basic land types among lands you control, not how many lands you control or how many of any type

She also becomes a 5/5 with evasion if you have even one life above your starting total

As such, using Beta lands was the optimal play since you could use expansion sets with them