For X generic and double white, Wrath of the Skies functionally reads as Destroy each artifact, creature, and enchantment with mana value X or less. Yes, theres some text about energy counters tucked away in there, but thats very rarely going to matter
It stops people formulating long term plans, leaves reactionary interaction stranded in exile, and is a pretty reasonable piece of lite stax
But if there's one thing Magic: The Gathering players love, it's exponential growth
The inability to make mana for things like Nissas Pilgrimage, From Beyond, Nissas Renewal, Ugin, the Spirit Dragon and basically any plain ol spell restricts you to a very creature-heavy build
Brawl Not Legal Vintage Legal Timeless Not Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Notes and Rules Information for Ordruun Mentor: Mentor compares the power of the creature with mentor with that of the target creature at two different times: once as the triggered ability is put onto the stack, and once as the triggered ability resolves