Examples include Yuriko, the Tiger's Shadow as Yuffie Kisaragi and Ancient Copper Dragon as Final Fantasy I's Dragon of Mount Gulg
This is likely why the three most popular Mono Blue commanders are ones that provide mana advantage: Urza, Lord High Artificer turns all your artifacts into mana rocks, Orvar, the All-Form lets you easily make copies of your lands and/or mana rocks, and Minn, Wily Illusionist ramps out permanents (including lands) whenever your illusions die
7 Afterlife Insurance Still In Debt, Even In Death "Draw a card" on a cheap spell is enough of an insurance plan (pun intended) to make just about anything playable, since it can replace itself when the effect isn't useful
[casthaven]Squirrel Wrangler[/casthaven] on the other hand is a pretty sweet under-the-radar creature that you want to drop just in time to finish a player off by crippling your mana base
When Mirrodin was introduced to the world, the combination of Affinity and cards that care about the artifact supertype quickly broke Standard