Shimmer Myr is a casualty of leaning into the Phyrexian elements over the artifact support
Iymrith is among the better options for tap-out control finishers in Cube, and while this wont be the most powerful strategy in Vintage Cube, this card is definitely playable even there with the right supporting cast
Legendary Creature Time Lord Doctor2/4 Haste Into the TARDIS Whenever The Ninth Doctor becomes untapped during your untap step, you get an additional upkeep step after this step
"First I researched lotus flowers in photographs and designed a pattern for the petals," Freese explains
It's important to note that he doesn't lose the counters when you use the ability, meaning that you can take advantage of the ability as you ramp up to the desired amount of counters you want (assuming you can't get them on him immediately)
Have Keith on, and help the project