These decks are packed with huge cmc spells and plenty of ways to cast them for less than their cmc, such as using Fist of Suns or adding discounts to them (Dig Through Time)
The Beast, Deathless Prince rejected Lorcana card, Im sure A threaten Commander that isnt Brion Stoutarm
Polukranos Reborn // Polukranos, Engine of Ruin is solid and cheap, as is Reef Worm
Once you pass the turn, Alexios goes from a four-mana 4/4 with trample to a four-mana 5/5 with trample and haste
This is a complicated way to use an already complicated mechanic, but Wizards is experimenting with higher complexity in Limited and board complexity is streamlined from Limited being all but exclusively digital nowadays
Sadly this is just very low tempo and pretty low powered