Follow those simple rules and your cards and spells will be safe
Combine those payoffspayoffs and discountsdiscounts and the fact that your commander costs six mana, and you'd be crazy not to be playing every ritual available
Since it's a legendary creature, there is a big chance that you won't see it much outside EDH, and the only other format that could use Myrel effectively would be Modern
They also mostly have harmless effects in play: Greed in the black castle and Sylvan Library in the green (the computer spends all its life and mana drawing too many cards), Leviathan in blue (the computer will laughably strangle itself sacking its islands to that), Elder Land Wurm in white (trades with Juggernaut, fly over it with Hyppie, or just Paralyze it.) The scary one is Mana Flare in the red castle, which plays a little too well with the red decks powering up X damage spells
When it comes to Magic: The Gathering, I know going in that the artwork is going to be top-notch