For example, control decks have no problem digging through their decks, so having one-offs won't affect them as they will be able to get to their sideboard cards easily (and this is a big reason why control decks are often so good)
Beyond that, a counter doubler that distributes counters across the team is just a filthy card
to Cabaretti Cacophany , filled with "loads of low cost creatures"
You can pay seven mana to meld him with The Mightstone and Weakstone to create Urza, Planeswalker, who has a whopping five different abilities you can use - and you can choose to activate two abilities per turn instead of just one
There are also unique role-players like Spider-Ham, Peter Porker, who not only creates a Food token for sustain but also pumps a whole menagerie of creature types, so its a quirky lord