This card represents all that is uncontrollable about the mana on Valkri. It and Grand Entrance are the only 5-color spells in the set. I can't decide what the best way to make this card. These are the three potential ideas I've come up. Any suggestions? I could always mix-and-match the abilities and the P/Ts are preliminary.

"Vigilance, trample, haste" & "Whenever ~ becomes the target of a spell or ability, put a +1/+1 counter on it." 3/3 -- The three keywords, from Horde of Notions, complements the growing nature of the other ability, which represents it feeding on magic.

"Whenever a player casts an instant or sorcery spell with a single target, that player copies that spell for each other object that spell could target. Each copy targets a different one of those objects." 4/4 -- This is the most chaotic choice, which I like. It's reminiscent of Precursor Golem, but super-sized.

"~ can't be the target of spells or abilities, including when it's not on the battlefield." 5/5 -- I'm not even sure if this works. It's supposed to be shroud that works everywhere. For example, it can't be countered or exiled with Thraben Heretic.

To the last ability: Mmm. It also couldn't be Zombifyed, so the ability might be hurting the creature more than helping. I would assume you'd add Hexproof. Though, I also think an effect like "Protection from everything, everywhere." is a funny statement.

I like the universal Radiate. It's like everything's an Ink-Treader Nephilim!

BTW, I think any WUBRG creature should be at least 5/5. Remember that vanilla WUBRG gets you Fusion Elemental at 8/8; mythic WUBRG gets you Sliver Overlord or Maelstrom Archangel.

I also like that ability best. I'll bring it to 5/5 as well. It also reminds me of ricochet (e.g. Mirror Spirit, Mirror Shield), the mechanic I was considering for the RWU shard.