The effects will likely run the gamut of design possibility - revealed cards with Corrupted buff creatures, bestow keywords such as lifelink and even power on enticing activated abilities
(Choose any number of permanents and/or players, then give each another counter of each kind already there.) Sorcery Ramp (CTRL to add secondary) Removal Mesmerizing Dose Enchant creature When this Aura enters, tap enchanted creature, then proliferate
Even Shalai's activated ability is more powerful than Sigarda's, offering a mana-intensive finisher for Go Wide strategies to close out the game
Stay safe, and start brewing
It's Nature's RhythmNature's Rhythm that takes the crown
For example, if you control The Ozolith when Essence Channeler dies, you'll put the appropriate number of each kind of counter onto both The Ozolith and the target creature