Filter lands are great in multicolored decks that want to ensure they have access to the right colors of mana at all times
Scourge of the Throne gives you one when you attack the player with the most life, Hellkite Charger, and Aggravated Assault both give you extra combat by paying mana, and World at War, Waves of Aggression, and Relentless Assault are all sorceries that give you extra combat (the former two being able to be used twice)
Note that this is not a bad card, and it will see play across all eligible formats, but it won't gain the momentum of the past Teferi planeswalkers or their market values
Rather than being primarily about reprinting expensive cards, the Challenger Decks are designed to give players decks that are at least Friday Night Magicplayable right out of the box and, ideally, legitimate top-tier Standard decks after a handful of upgrades
Bosk Banneret Bosk Banneret is part of a series of mono-colored Banneret cards that were unveiled in Morningtide (a top-flight set for kindred Treefolk shenanigans), one for each color, that cost two mana and reduced the cost of spells that shared a creature type with them
I ended up using the flavor text to reinforce that the Surgeon Commander liked "creative templating." The name came about because I realized that since this was a Commander-focused card and we were already going to make a joke about templating for Commander, we could pick a name that played into the joke