mtg how many lands in a commander deck Mana Bases: Should You Run? Secrets of Strixhaven Commander Decks:

In a deck with an abundance of low-costed creatures, as red often has, it isn't too hard to find one goblin token or construct creature to throw in the bin for the mana

Overlord of the Balemurk Overlord of the Balemurk is a nice value and self-mill card that has seen play in many Magic formats, from Standard to Modern

Color Identity: W, U, B, R, G Cards Kenrith, the Returned King K'rrik, Son of Yawgmoth Blood Celebrant Training Grounds Initial Card State All permanents on the battlefield

However, Liliana, the Last Hope pairs perfectly with Grim Flayer in this situation by shrinking the Sylvan Advocate

I think they all have their merits and I wouldn't consider you wrong for playing any of them