Well I've built five decks using ONLY cards found in the Foundations -- the main set, jumpstart, and starter kit -- which are able to compete just fine with precons and mid-power tables, so new players can immediately try out the format with most of the cards they already own
Annex Sentry Ive learned to fear any Oblivion Ring-style ability long ago, even when its limited in effectiveness
In Disney Lorcana's The First Chapter, there are twelve legendaries in the set and they are pretty powerful
Get them for all of your Sliver needs
You also get to play the mini Fact or Fiction game every time a sphinx hits your board
9 Battlemage's Bracers Commander 2021 did many great things for Lorehold, or Boros (white/red), and one of those was the introduction of Battlemage's Bracers