All Man-o'-Wars Visions saw the printing of many good creatures with Enters abilities, including the original 2/2 tempo machine for three mana, Man-o'-War
Legendary Planeswalker - Oko Quantum Misalignment Create a token that's a copy of target creature you control, except it isn't legendary
I have seen it is burn, RDW, zoo and Izzet tempo but they are the most aggressive decks in the cube with the potential omission of white weenie
The result is that it decides, but not ends, the game frequently, and, when it doesnt, will often become the focal point for the rest of the game as players fight over it
Of course, thats just how the rules work, and how any card game goes is going to be heavily influenced by what the cards are