For some like the planeswalkers it is for technical reasons, while both can offer a great influx of cards immediately they are dependant on the board state
Storm of Saruman - Weve seen spell copy enchantments before
Since theyre all part of Phyrexia, Phyrexian creatures usually relate to Phyrexias main themes: artifacts, oil counters, proliferate, +1/+1 counters, infect or toxic, and now incubate
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