You choose which player, planeswalker, or battle the new creature is attacking
Iron Valiant ex has a storied competitive history, primarily due to its Tachyon Bits ability, which allows you to place damage counters on the opponents Pokmon just by moving Iron Valiant into the Active Spot
Patience because you cant commit too many creatures on the field to prevent being swiped by a mass removal (ex: Golden Demise, Fiery Cannonade, Settle the Wreckage)
counters to "0"
You can bounce a spell if you prefer, in lieu of just a creature, and thats really flexible
As a beloved fan-favorite, Dragapult's spot is warranted, especially considering the strong demand that this card commanded as a regular inclusion in Twilight Masquerade