Castle Garenbrig [Throne of Eldraine] Ultimate Masters " the priest said

" the priest said

Set: Invasion Type: Instant Rarity: Rare Cost: {2}{U} Change the text of target spell or permanent by replacing all instances of one color word with another or one basic land type with another until end of turn

but how could that be

where X is the number of colors among those creatures

Mausoleum Wanderer gets +1/+1 until end of turn

Castle Garenbrig [Throne of Eldraine] Ultimate Masters " the priest saidSet: Throne of Eldraine Type: Land Rarity: Rare Castle Garenbrig enters the battlefield tapped unless you control a Forest. {T}: Add {G}. {2}{G}{G}, {T}: Add six {G}. Spend this mana only to cast creature spells or activate abilities of creatures. Without Garenbrig's strength, the realm would succumb to the wilds.