None provide any tempo and none affect the board in a meaningful way by themselves
Nether Shadow is a creature that can pop out back from the graveyard once most creatures have died, and it has an ability that would be keyworded to 'Haste' -- almost all creatures need to take a turn after being summoned before they can attack, but Nether Shadow can just do it the moment it pops in the battlefield
At the time this was my first big card and the owner did a great job walking me through teaching me how to negotiate and get on my feet in the hobby
Most recently, it made its way to the top of a massive tournament in Japan, leveraging the power of Gholdengo exs Make It Rain attack to OHKO anything on the playing field, as well as a host of consistency cards like Lunatone for draw support and Genesect ex for card search
Currently, a total 6 are available on Cardmarket
The easiest way to win in Magic the Gathering is to get your opponent's life down to zero