Yes, they can be a bit expensive for the effect you get, but they offer unrivaled flexibility that's hard to say no to
If you have a way to intentionally ping your own creatures, Silverclad Ferocidons can clear out a lot of the board for you
Your opponents wont be able to fetch their lands or tutor for their combo while the Arbiter is there unless they pay 2 mana more
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Kuja from Final Fantasy IX Vivi Ornitier from Final Fantasy IX This fan-favourite Wizard gets bigger and deals damage to all opponents as long as you have Blue and Red mana to spare
Key also created all-or-nothing situations, because you can strand the Key without anything worth untapping