Historically, 2-2 was commonly played, but many modern lists run 3 Garchomp C and 1 Garchomp C Lv.X, since it helps to have more in the SP mirror match
Finally, Consecrated Light and Shadow-Imprisoning Mirror are both threats in the side game due to their ability to shut off power cards like Plague, Zombie Master, Caius, Mezuki, and Dark Armed
Where a lot of the others are floating, ephemeral, almost free of their mortal coils, this spirit looks to be dragged from its repose
In the early game it can be a brutal speed bump for your opponents' game plans, but its potency definitely wanes in longer games
Duplicant is a more permanent answer and one without any targeting restrictions, but Duplicant will never cost two mana in a pinch
Also, in the case of Sunryong Inti, Destiny Hero Diamond Guy sends the three -way tribe of the ice gate to the cemetery and tries to use it as the effect of the next turn diamond guy