Shared Animosity scales up according to how many creatures are attacking, so a token-heavy build like Goblin tribal is the ideal home for this aggressive enchantment
The first is mobilize, the Mardu mechanic, which is a creature mechanic that triggers when a creature with mobilize attacks, creating a number of 1/1 red Warrior creature tokens that enter attacking
This art style is also depicted in the rarest cards of the set, known as Iconics, which also feature full-art and additional foil treatments
Although it is not necessarily overpowered, casting a Ledger Shredder on turn 2 followed up by a Mishras Bauble allows you to connive with the bird straight away
While I think I overrated the creature half of this card a little, I think I got this one pretty close
For the everyday casual folk like me, this is just a boring commander