Haste for all your Warriors at just 2 mana is basically a staple for Warrior Tribal
From there, you can decide what you think is strongest to pair him with.
Well, since this Centaur Spirit can let you cast a dork from your graveyard once per turn with normal spell rules for that
While Gerrard draws you an extra card on each of your turns, to start the game with a maximum hand size of 3 is abysmal and you'll soon find yourself looking to dig for a Reliquary Tower, Thought Vessel, or another Spellbook-type effect, lest you need to discard more cards than you'd prefer
One exception to note is Uncommon cards, which are represented by the rarity symbol of an open book - the logic being that an open book has two sides, or pages
But when you flash it back, you get to copy it, so you can get a two-for-one