Too many were made and kept in good shape to become rare
Gaining three life also grants multiple rewards, including drawing cards for Haliya and untapping Ragost, which can be easily achieved by using Food
Here, let me give you a quick example: Prior to Invasion Block, here were the instant/sorceries that destroyed a target enchantment, in the order they were printed: Of those, only Serene Offering had an on-resolution benefit of gaining some life
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Other filament types should work as well
I just released shallow trays version 32 (Only shallow trays are released, and the zip contains all card sizes) To show the stability, I added some filament spools on top and wanted to let you know that I almost exclusively use Sunlu Filament @ 10USD/kilo (I use recycled PLA)