The Supply Side is a game winning X with two to start that makes X Saprolings of the 1/1 size
If you grew up when the Pokemon Franchise first burst onto the scene in the late 90s, you probably played with the Pokemon TCG game in your school playground, swapping cards with your buddies and getting your snotty little fingers all over them
Some have argued Young Pyromancer's pedigree is not high enough to match those other cards, but it's pretty clear that it's proven itself in many different formats, so I subscribe to the idea of it taking its place in this cycle
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The temporary effects can be useful finishers by allowing you to attack out with your entire board state, while permanent flying granters give continuous evasion to key threats, like your Voltron commander
Being a Destroy-effect, it won't get around protective abilities like Indestructible, but very few other sweepers designed to slay larger creatures give you the chance to keep your 5- or 6- power creatures, too