There are a bunch of unanswered questions around maximizing companion, but Lurrus eliminates half the puzzle by naturally slotting in a bunch of homes without any real deckbuilding restrictions
Love this thing at the kitchen table in Commander loads
When Id pick it: You want another POD-style shop to compare against the top two Youre testing which workflow you personally find least annoying Quick best for guide Best overall for print on demand MTG proxy cards: PrintMTG Best alternative for global shipping-first expectations: ProxyFoundry Best if you want lots of third-party review volume: MTG Print Best if youre obsessive about previewing sharpness and shopping by quantity tiers: proxymtg.com Dont skip the proxy etiquette part Most playgroups are fine with proxies when everyones on the same page
A lot of balance and care goes into choosing the cost of a card, more than I can express here, but looking for similar effects on existing Magic cards can give you an idea of a fair costfor example, a ramp spell that puts two lands into play ought to cost 4 mana, per Explosive Vegetation
If you stick Curiosity on Niv-Mizzet then all you need to do is draw a card (which is something Niv is pretty damn good at) and then you go off, in a flurry of draws and pings
With Fangorn in play, unspent green mana doesn't disappear as phases and turns end, bypassing the main limitation of adding mana to the mana pool