3 Phantasmal Image Phantasmal Image is the ultimate clone if all you care about is copying ETB effects
If the most popular deck is a fast, aggressive creature strategy, you know that your deck needs a plan to survive the early game
Thassas Oracle doesnt even need to be in play when its trigger resolves in order for you to win, and should someone Stifle your first attempt, youre still in the game to try again
Ive noticed players tend to be critical of the fail-case when evaluating scalable cards after all, a vanilla 4/4 for four mana is not a card in consideration for most cubes
You can basically scry the top of your library equal to your basic land count, which can be a lot as your color count increases, and then in a Five Color format with at least 300 cards redundant ramp like this which can have added value is not nothing
Two other artifacts, Chaos Wand and Bag of Devouring, send cards into exile, the Bag provides good protection mechanisms for creatures affected by spells or abilities