If you control an "Adventurer Token": You can place 1 Field Spell that mentions "Adventurer Token" from your Deck face-up in your Field Zone
Effect: When this card battles an opponent's monster, if your opponent has 3 or more face-down cards in their Banished Zone, this card gains 1000 ATK during Damage Calculation only
Casual Commander mana bases are getting better, and precon mana bases are hardly even attempting to keep up
With the Welder and a Volcanion to cheat out Fire Energy, Fiery Flint and Fire Crystal to ensure you have Fire Energy in your hand at all times, Heatran GX as an alternate win condition, and Heat Factory for draw, there is little that isn't available to the player in a Reshiram and Charizard GX build
It could be some combination of these, but we may never know for certain
9 Scourge Of The Throne The Only Time It's Scary To Be On Top The Conspiracy sets introduced tons of mechanics that force action in Commander games