TicTac didn't specify the playstyle for this deck
E'Rah's motives rely entirely on destroying hope and light, with the intended goal of destroying the Astral World a la Don Thousand
Mega Braves steadier appreciation pattern suggests healthier market fundamentals: consistent demand driven by Mega Evolutions broad appeal rather than speculative hype around a single chase card
There is even a meld card where Vanille and Fang merge together, flip over, and are a big creature on the back
If this card attacks an opponent's monster, during the Damage Step only, negate the effects of that monster while it is face-up on the field (but its effects can still be activated), also its ATK becomes half its original ATK
You can also set up some Johnny engines where you proliferate their creatures with +1/+1 counters, or just play nice and spread some +1/+1 counters here and there