Some of the first cards that we saw spoiled with the mechanic were Arlinn, the Pack's Hope and Tovolar, Dire Overlord, two impressive cards if you ask me
Legendary Artifact Enchantment Counters (CTRL to add secondary) Creature Adrix and Nev, Twincasters Ward (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays .) If one or more tokens would be created under your control, twice that many of those tokens are created instead
However, with the release of War of the Spark in 2019, Wizards of the Coast designed Planeswalkers with static abilities
We only know of the siege subtype
Phyrexian Altar allows for some broken combo loops by letting you convert creatures into mana, yet it doesn't do much of anything by itself
Protection Protection (from X) is a lot like conditional Hexproof