Escape costs usually involve some amount of mana and exiling a number of cards from your graveyard
It is also why black is the most common colour alongside blue in legacy and vintage where you need to have some interaction with spells and their potential to be cast so as to not get run over by broken things
Some of the cards have powerful effects that are well-designed to work with encore and be super influential to the state of a game while still being useful when you cast them from your hand
However, there are those who say (and here it may be a majority opinion) that the effort is not worth it, as the prize pool at the end of the season can be mediocre compared to the time dedicated to staying in the Mythic and, even so, being in the Mythic you may not be ranked high enough to be invited to an event
Invest in a $30 uncut sheet toploader (such as this one here) and you should get a stronger return on the investment
Aminatou, the Fateshifter In Esper colors, which are strong for blink strategies, you can fill your deck with cards that have powerful ETB triggers and add value boosters like Panharmonicon