This can absolutely destroy some players in the late game where all it takes is one slip to concede victory
If you gain an amount of life "for each" of something or "equal to the number" of something, that life is gained as one event and Minwu's last ability triggers only once
The alternate name has no effect on gameplay. If you put Thrum of the Vestige in your Commander deck, you're in fact putting in a Lightning Bolt as far as singleton deckbuilding rules go
Sahagin 1U Creature : Merfolk Warrior Whenever you cast a non-creature spell, if at least 4 mana was spent to cast it, put a +1/+1 counter on this creature and it cant be blocked this turn
He also has the shift ability, so if youve got another Genie card on the board, you can bring the cost down to six ink instead
She is able to circumvent this if the controlling player can banish an item in-lieu of Belles ink cost