Typically this is the kind of thing I keep in the board for reanimate decks or some other archetype that can produce something before affinity kills it that four damage can't handle
(The turn you must wait to use a freshly-played character while they dry is also a much cuter image than Magics summoning sickness.) Being able to add a facedown card from your hand to your inkwell immediately overcomes the common MTG and Pokmon bugbear of finding yourself with no land or energy cards - any Lorcana card with the ink marker around its cost can be turned into ink - and sparks a delicious dilemma about which cards to sacrifice to the inkwell in order to play others
The Caveats We generally start these lists with a few rules
In a 60-card "kitchen table" deck or a 100-card Commander deck, Sauron players can use generic on-color cards for effects like removal, card draw and counterspell, with strong creatures and support spells from Tales of Middle-earth to make the most of Sauron, the Dark Lord's effects
Sultai Flash also benefits from access to two Temples, which might allow us to play the ultimate creature/removal hybrid and Teferi answer, Murderous Rider
The previous record-holder was also given a perfect 10 Gem Mint rating by card grader PSA