Tolabow is the most mechanically unusual of the eight, because its exception isn't fixed on the card — it's a choice the deckbuilder has to make before a single card gets picked. Whenever you cast an instant or sorcery, Tolabow creates a 1/1 blue-and-red Otter with prowess, so the deck wants as many cheap spells as it can find — and the Rulebreaker clause is what lets it go get them from a second colour entirely. It's the lowest-built of the eight so far, likely because that up-front colour decision is an extra step most other Commander deckbuilding never asks for. The Oracle handles it with a dedicated colour-picker modal the moment you select Tolabow, and restricts your basic lands to just your chosen colour plus blue — not all five — so you're not carrying dead Forests and Plains for a deck that only ever wants two colours of mana.