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Description
While it can be argued that a card like Eternal Witness will often work better in some decks than Snapcaster Mage, you cant use that card to give something like Mana Drain flashback at instant speed to stop a key threat and keep you in the game

However, there are no color restrictions, so you can play cards of other colors, or no colors (such as lands)

It seems at best to only pull you some cards if it attacks or someone throws removal at it and it doesn't have haste

While not a mono green deck, I have a Simic (blue/green) Sea Monster deck that I play this card in

Your strong cards become weaker
