in MTG Start your engines! is a keyword ability introduced in Aetherdrift , released on February 14, 2025
And there are a number of reasons for this
The power level on this one is roughly that of Phyrexian Arena Id estimate and given that a slower, less mana efficient Phyrexian Arena was one of the strongest card drawing tools in the last Standard (Underworld Connections), Id be very surprised if Sultai Ascendancy didnt prove to be very good in Magics most played Constructed format, likely as the best enabler for a delve-abusing Sultai midrange or control deck
That experience was one of the odder interactions I've had in my time here
So, if you play a retriever and make a copy of it, you can then sacrifice the copy to KCI or Ashnods Altar
This worked for a number of reasons: Along with the 21 sources of card advantage, I also run five recursion effects four of which are repeatable