Both of which have incredibly powerful abilities outside of those counters
Vessel of the All-Consuming Color Indicator: Black and Red Enchantment Creature Ogre Shaman Trample Whenever this creature deals damage, put a +1/+1 counter on it
(Targeting opponents, anything they control, and/or cards in their graveyards is a crime.) Legendary Creature - Human Warlock Gleaming Overseer When this creature enters, amass Zombies 1
You can add a Loyalty to allow you to cast creature spells as though they had flash, which is excellent for enabling transformations, and they even come in with a +1/+1 counter on them
I can imagine few things more satisfying for a Gruul player than flipping creature after creature off the top of their deck, all with a haste boost from Rhythm of the Wild, paying half the usual mana thanks to Nikyas influence