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It works well with artifact reanimation effects to loop powerful ETBs like Portal to Phyrexia

Whenever Sonic the Hedgehog attacks, put a +1/+1 counter on each creature you control with flash or haste, the text reads, while also creating a Treasure token (tapped) when one of those creatures is dealt damage." Put this unlikely (some may say unholy) duo together, and you have Sonic dishing out counters, and then the Winged Hive Tyrant giving everything haste and flying

Of course, it's not legal anywhere, though it works completely within black-border rules, so maybe a Rule 0 conversation can get you there

Ive mentioned how the named Amonkhet gods often feature in keyword soup decks, but imagine if you face a Kathril, Aspect Warper deck and steal their Sire of Seven Deaths