Im pretty sure this would have been a little too strong in Standard if the goal was to assemble big mecha robots for 8 mana or more
Creature kill was just so bad against him game one, but even if they know his sideboard plan, how much creature kill can they leave in for just two Baneslayer Angels
Land removal: Demolition Field , Strip Mine , Armageddon, etc
Related: All The Brothers War MTG cards worth money | BRO price list for Nov
Put a +1/+1 counter on that creature for each nonland card discarded this way.) Whenever you attack, target attacking creature connives X, where X is the number of attacking creatures
Alongside the rarity of the card itself, when a sale happens matters a great deal too