Slivers were introduced in 1997s Tempest as a group of hive-minded creatures that could share their abilities with other slivers
Sometimes though, those rules will affect other parts of the game, like Belles House, Maurice's Workshop, for example, which gives a one-cost discount to all your item cards for as long as you have a character there
A 1/2 lifelinker for 1 mana isnt bad
Mono-white angels (with maybe a Collected Company splash) has been the build in most 60-card formats that angel decks had a shot in, so if you construct a Giada deck, youre likely playing with cards already in your collection
It picks up +1/+1 counters pretty much for free, transforms into a huge lifelinker on a whim, and is impossible to kill once it does
This ability gets around Commander tax, reducing its cost down to just one black and one red so long as you have enough artifacts out