Minwu's last ability triggers just once for each life-gaining event, whether it's 1 life from Al Bhed Salvagers or 3 life from Balamb T-Rexaur
We see Urzas Incubator in 107,987 decks, which is a pretty respectable number for a card that requires a certain kind of list to do anything, and as you might have guessed, most decks that play it are some form of creature deck, especially creatures that demand a bit of a mana investment
I just dont think they have the support to be effective commanders
Chandra is a good flex card that can be good against a lot of different matchups
Then the fun commences with summons that are both sagas and creatures and offer a wealth of effects when you can add or remove counters each turn
The serialized cards are hard to find while cracking packs, resulting in cards like Mox Amber and Wurmcoil Engine having serialized schematic cards that are getting sold for thousands of dollars