Black follows with four, and blue has just one, Saiba Cryptomancer
This card is an iteration of Ragavan, Nimble Pilferer , a legendary creature that, whenever it deals combat damage, creates a treasure token and exiles the top card from your opponent's library, allowing you to play it until the end of your turn
And frankly, if you aren't playing Armada Wurm in your deck, I want to know why
Whenever a creature you control with power 4 or greater enters, you may draw a card
This gives red some fantastic versatility and card advantage, as well as access to some of your opponents strongest cards
But for only 1 mana, that card is going to be the best, highest quality card your deck has to offer, possibly netting you a lot of card advantage through a board wipe, stopping someone else from doing the same to you with a counterspell, or setting you up to complete an infinite combo