Some decks, like Izzet Faeries, use them to power up Skred
This won't create big plays, but it will always be there when you need it
When you would Special Summon an Armor monster, you can place eitherit or an Armor monster you control face-up in your Sepll & Trap Zone as a Continuous Spell card with the following effect: Once per turn, you can either Special Summon this card from your Spell & Trap Zone in Attack Position or place 1 Armor monster you control face-up in your Spell & Trap Zone as a Continuous Spell card, it gains this effect, while treated as a Continuous Spell card and if you do, Special Summon this card from your Spell & Trap Zone in Attack Position
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That isn't to say that evolution decks aren't viable though
If a spell cast from your graveyard this way would be put into your graveyard, exile it instead