Also, these types of cards (usually) let you remove other permanent types besides creatures as well
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4 Fatal Push 4 Gifted Aetherborn 2 Treasure Map 1 Arguel's Blood Fast 1 Battle at the Bridge 1-2 Dread Shades 1 Mastermind's Acquisition I personally wouldn't cut Mastermind's Acquisition against anything but a hyper aggressive deck since it's so versatile
Charge Counters Charge counters measure another quality on a card, which is often variable
Saheeli generates a point of energy whenever you play an artifact or an artificer, and then has the option to spend three energy, at the start of combat, in order to create a 5/5 artifact creature token that's a clone of another permanent that you control
The biggest note about them is because they looked a lot like Adventures, players wanted to play them as such