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The big reason for that is there are no bans in Timeless, and thus, can play with the most powerful cards that made it to Arena like the fetch lands

Note the artifact type, and the free win-con attached

You can also sacrifice Ultimecia, Omnipotent to Altar of DementiaAltar of Dementia, giving you enough cards for the front face's transform ability, and then recast it via Muldrotha, the GravetideMuldrotha, the Gravetide

You can get to your best mill and copy cards quicker by playing cards like Visions of Beyond and Into the Story to draw a ton of cards at low costs since your opponents will have a lot of cards in their graveyard