Adventure Adventure is a mechanic that ties an instant or sorcery onto a permanent (with the exception of Twice Upon a Time)
I believe this is valid because silver border, now acorn, gives the entire team, design, play, world building, art direction, marketing and everything in between, artists, players, and article writers a chance to go out to the very edges of what the game could do
( can be paid with either or .) At the beginning of combat on your turn, you may pay
Add in a few flicker effects to reuse your best ETB triggers once you get going, and your opponents wont know what hit them until its too late
This storage solution makes finding specific cards quick while protecting your magic collection with proper card storage
Magic the Gathering Foundations Collector Booster Box