For most archetypes, an effect like this would be amazing
Efficiency is super important for Magic cards in general
Only cards of the same rarity can be traded
(As long as its on the stack, players cant cast spells or activate abilities that arent mana abilities.) Shadow the Hedgehogs second ability, which grants your spells Split Second if cast using artifact mana, has generated a lot of buzz in the MTG community already
These commanders are among the most unique from the release and have potential to cause some price spikes for weird, forgotten, older cards that happen to work with their abilities
The core strategy is the same here use multiple Reshiram to dump R Energy onto the field but the key attacker is White Kyurem- EX , a card that can 1HKO many Pokmon- EX with its second attack