Just went on a 14-0 run into mythic with this sweet #alchemy Wrenn the Realmbreaker deck on #mtgarena.
I haven't found a single matchup that has felt hard and post board this deck feels unbeatable against most decks.
The flex slots are the 1 ofs and the weakest card is likely the Tyvar, but I have not drawn that card enough to really have an opinion about it. The synergy between the Wrenn -2 and Virtue of Persistence/Porcine Portent is huge. Being able to downtick on your 3 mana planeswalker and be able to dig 3 cards deep for removal is absolutely insane. It has won me several games with being able to find removal for a Sheoldred when my Clock was about to tick to 12. Additionally being able to power up your creature lands with the +1 is absolutely insane. Not many decks are running planeswalker removal especially mainboard that a turn 3 Wrenn (which admittedly with the mana base is sometimes hard to power out) can be absolutely unbeatable.