There was little to no power balancing, with some cards being ridiculously overpowered for their casting cost
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Beyond making creatures stronger, other tribal effects might give you a bonus or ability that scales based on the number of creatures in play, like [mtg_card]Wellwisher[/mtg_card] or [mtg_card]Graveborn Muse[/mtg_card]
In theory, with a Naban, Dean of Iteration on the battlefield, you only need half the number of blue mana symbols on the battlefield to make Master of Waves good (for example, in the worst-case scenario where you have just a Naban, Dean of Iteration and a Master of Waves, you'll still end up with 10 power across five bodies, which is a pretty reasonable deal for four mana, and if you throw just one other Wizard into the mix, things cat get out of hand really quickly when Master of Waves' enters-the-battlefield trigger is doubled)
His -1 bounces a creature or planeswalker