mtg cards with mobilize it gains haste until end of turn oracle:mobilize (game:paper) set:tdm · Scryfall

As a Rare, Flame of Udun has a 1 in 40 (~2.5%) chance of being present in any MoM booster pack, and a 3 in 40 (~7.5%) chance of being in any MoM starter deck

see for the others

The idea of simplifying multiplayer combat is very attractive, but comes with a number of problems if someone outside of your reach becomes a major threat

So, Vexing Gulls Flash is pure upside, and this mechanic provides even more utility

Competitive play is a huge part of any TCG, and if a dud of a set were to release right as the biggest event in the game was due to take place for the first time, we could be talking about a very different trajectory for the game