Much of the talk Ive seen so far has involved Nethroi, Apex of Death (some it from me) and Illuna, Apex of Wishes, but I suspect that well see some creative builds from the community with the others as well

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Graded Population Report: Cresselia #228 Visualize the distrbution of grades in the chart
So long as we have milled enough to get the right mix of artifacts in our yard, Trazyn can threaten any number of game-ending combos without needing to resolve or reanimate a second card
It's important to note that the higher the player's level gets, the more XP they'll need to level up, and the only way to reliably farm XP right now is by winning PvP battles, which can be a bit of a grind
The fact that all of this is completely outside the players control only makes the experience worse