Plasma Caster's ability is not once-per-turn, so if you have multiple energy counters to pay, you can potentially use its effect on all creatures blocking your creature
The only difference is that Mob Justice will also count your other creatures, in case you have any non-Goblins in play.

Vintage Market Resilience (But Not Immunity) WOTC-era and vintage grails showing relative strength but facing pressure: Holding Strong: True grails (1st Edition Base Set Charizard PSA 10) Low-pop vintage cards in high grades Iconic Gen 1-2 cards with generational nostalgia Vintage sealed products (original booster boxes) Showing Weakness: Mid-tier vintage cards (not top 1% rarity or condition) Common vintage cards even in high grades Vintage cards without strong character appeal Slipping as buyers become more selective and liquidity dries up Why the market is correcting TL;DR: Multiple factors converging simultaneously: aggressive overproduction by The Pokmon Company creating supply gluts, too many chase card variants diluting attention, macroeconomic pressure reducing discretionary spending, and speculation fatigue after years of unsustainable "everything goes up" mentality

Hitting one land per opponent when youre already at six mana is unlikely to make a difference, so that mode isnt great either
He has the Evasive keyword, which means he can only be Challenged by characters who have Evasive
White and black decks can at least remove this, while RG decks are almost comically out of luck (deathtoucher + Chocobo Kick maybe?)