There was a different rule in place regarding what happens when a player has unspent mana back when cumulative upkeep was still being printed
Alexis Rhodes / Asuka Tenjoin ( Tenjin Asuka ) Voiced by: Sanae Kobayashi (Japanese)
They get the job done through brute force thanks to their size, armor or by simply being powerful
[spoiler=Alien Betrayal] Alien Betrayal Quick-Play Spell Effect: Activate when an "Alien Commander", "Alien Mind Lord", or "Alien Warlord" with A-Counters on them that your opponent controls declares an attack: destroy all "Alien Commander", "Alien Mind Lord", and "Alien Warlord" with A-Counters on them that your opponent controls
Nin is also a pretty solid card, but for the most part you'll be spending your mana on playing pingers and pingers' tools, so there wouldn't be much left over to dump into her ability
[48] Yuma could sense Don Thousand's awakening