Firstly, it had ex cards and Illustration Rares front loaded in the order of the pack, which isnt typical - modern packs usually have seven standard cards followed by three rare or above, then an energy
If Ghost Ark gets answered, Technomancer covers the same recursion job for a turn, just without the loop
The first cares about creatures entering during combat, which isnt exactly a common occurrence in most games
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Try finding that anywhere online
For example, in competitive games, completing a mission or a renewable daily challenge usually takes less time and yields more gold (or whatever the main currency is) than you'd earn by spending the same time grinding ladder matches