For example, you need one Forest mana and another mana of any type to place Poison Dart Frog on the battlefield
This lets you pick and choose who you want to keep close, and who you want to give extra resources too
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Yerco Valencia [CL] (9/2/3), Raging Bolt ex/Teal Mask Ogerpon ex 55
You can enchant your opponents massive creature, and suddenly you can totally stonewall it with a 1/1 token or 0/1 Argothian Enchantress
Ideally you'd be putting this on something withy lifelink to keep the gains going, or even Qala, Ajani's Pridemate to increase the buff when it swings with other creatures