There's a lot of staples for Counters decks here, like Inspiring Call, Inexorable Tide, Hardened Scales, and it's the first time we've seen Damning Verdict reprinted, one of the best cards for a Counters deck as a one-sided wipe and it was quite expensive for that reason
Normally, nothing happens here
Serah is going to do a lot of work
"Commander ninjutsu [cost]" means "[Cost], Reveal this card from your hand or from the command zone, Return an unblocked attacking creature you control to its owner's hand: Put this card onto the battlefield tapped and attacking." Commander ninjutsu is a variant of ninjutsu that can be activated from the command zone as well as from your hand
Vance's Blasting Cannons is perhaps the most aspirational card on this list but is almost perfectly serviceable as just a red howling mine (do we have a good name for "effect that draws you another card each turn"?) It notably doesn't let you play lands, but cards like Outpost Siege don't give you the story equity this card does
