The main issue with Aura of Silence is that its an absolute dud in some matchups
A quick evolution to Gyrados from Magikarp with a very lucky Misty Supporter Card coin flip, might grant you one shot early in the game and stall the energy gathering of your psychic opponent, but chances are that by the time you've evolved and energized your big hitter enough to try a Hyper Beam, you've already been Psydrived for your full 150 HP
It flies over blockers and can destroy all nonland permanents with a chosen mana value, including tokens for free
When it came to actual rules, our Pokmon TCG cube followed regular gameplay and Standard format rules, with certain cards receiving errata for flavor purposes
In the early turns, Starting Town is strictly better than Vintage Cube regulars City of Brass and Mana Confluence, and you would often choose it over the other two in a late game with a dwindling life total
His fight ability is really powerful and Monsterous is a perfect mechanic for a Hydra