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Finally, expending mana is tracked even if theres nothing with an expend ability on the battlefield

This is more of a suggestion than a rule, as some archetypes, usually the anime ones (say Blackwings or Performapals) do not have a central mechanic, but especially in customs, where it is almost guaranteed that the opponent is seeing your cards for the first time, it is imperative that it is clear how the deck works

Players will just need a little bit of luck if they're to get the best out of it

It definitely got a much-needed pick-me-up from the new LTR amass support, since you could now build a bigger army faster than before