The only real difference between Tier 4 and Tier 5 is whether or not your deck is constructed with competitive play in mind
Sure, effects like this have existed before see [[Axis of Mortality]] but this is the first time we get it on a Legendary Creature
I guess it's probably just a taking extra turns deck, which is kind of boring, but makes perfect sense
Then when you cast things outside of your hand, you'll shoot one player for damage of its mana cost to kill fast
BPhillipYork: It's a mana dork that also mana fixes for your commander, so it just makes any green that wants to ramp out creatures smoother and more consistent, and it makes your commander uncounterable or some big legendary spells like Karn's Temporal Sundering or, Planeswalkers, which will get to hit the board then do their thing without a chance for interaction
rather as a legendary creature token