Firstly, its very playable in Standard
Three out of the four Pro Tours every year are Standard, and it's the most popular FNM format
Admittedly, that's a lot, and battles are brand new
I couldn't rank them in good conscience, but they still deserve recognition for their accomplishments
Several examples of typical black cards include Fukurou from Pillars of Strength [OP-03] which cant be KOd by effects, Kuzan from Paramount War [OP-02] which enables the player to draw a card when played before reducing the cost of an opponents Character by 4 during that turn, and Hina from the same set which when on block, allows the player to select any of the opponents Characters with a cost of 6 or less and prevent that opposing Character from attacking during that turn
For the cost of two mana, Jhoira can suspend cards, exiling them for four turns with four time counters on them, removing a counter at the beginning of each of your turns