Cutting a Ritual out of their deck can certainly make life harder for them, but its hardly an insurmountable problem
Inquisition of Kozilek No real shock as to the top two on this list
Red can easily generate mana advantage as well, be it through bursty rituals (Irencrag Feat), treasure tokens (Dockside Extortionist), free spell/polymorph effects (Fires of Invention, Tibalts Trickery), or the occasional outright mana dork/discounter/mana multiplier (Leyline Tyrant, Mana Echoes)
Ideal for collectors, anime fans, and players who enjoy booster packs, card game battles, and tcg adventures
Then after crafting, you get the X/X Skeleton Horror with power/toughness equal to the power of what was crafted
This setting is possibly the closest thing to a Pokmon journey that can possibly be replicated in real life