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You can give creatures you dont control -2/-0 until the end of the turn, you can create a taped Powerstone token, you can make a 0/0 Construct creature that has +1/+1 for each artifact you control or you can scry 1 and then draw a card

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7 Coastal Piracy Creature Card Draw Coastal Piracy, despite its name, isn't just support for Pirate decks, but it's good for any kind of creature-based decks

Prophetic Prism: this is a great color fixer, and it's a common

Bounty of the Luxa This is a fiddly and difficult card, not to mention slow

The price you pay for the resulting effects would be very expensive if attached to an instant or sorcery spell, but seeing that they are attached to a creature and can be activated repeatedly and at instant speed, the additional price seems a bit fairer