The Sideboard The cards in our sideboard are designed to do three things: help improve our matchup against aggressive creature decks (by far our worst matchup), fight three-mana planeswalkers (especially Teferi, Time Raveler but also Narset, Parter of Veils and Oko, Thief of Crowns), and answer graveyard-based decks (which we actually help by filling their graveyard with our mill spells)
When you have access to the best mana ramp, tutors, and card draw effects in the game, it wont take long to build huge hydras like Hydroid Krasis, token generators like Empty the Pits, or powerful payoffs like Villainous Wealth, all of which can be doubled on the cheap via Unbound Flourishing and will be making huge attackers simply for casting these spells
Crown Zenith packs can only be found within Elite Trainer Boxes and Special Collections, which means individual packs are not sold in stores
Still, an extra card is an extra card, hence the disdain for companions
First editions and god damn Manky lovin' shinies
Acidic Slime Acidic Slime is just annoying