Many decks interested in wraths want to play blue anyway, and being uncounterable is way more relevant than preventing regeneration, since its mostly been phased out, and common protection spells use phasing or indestructible
But these two are Bant counters creatures, and while they work really well together, I want to talk about their decks and what people are going to play
Key Cards Kefka, Court Mage // Kefka, Ruler Of Ruin Kefka, Court Mage is one of the main ways you'll be forcing your opponents to discard cards
Let's see the advantages: Perfect protection from water or dirt because there is no way for them to get to your set
Both these cards give our spells an alternative casting cost of WUBRG, and since Morophon gives our eldrazi spells a WUBRG discount, that means our eldrazi spells cost zero mana to cast