Where Sairook is strong and versatile, Gilford is even stronger … but not as versatile. In the right games and situations, Gilford can cause such chaos with the Bully ability that this can win the game on its own, but then again sometimes it just feels like a weak 3 / 7 that doesn’t do much.
Gilford is mostly a support unit, it needs you to already have a good army in the game. However, once that is so, it can help to disrupt enemy ranks against factions that care about positioning, and offensively can make the enemy summoner almost impossible to protect for your opponent.
At present, it's too early to give guidelines on how to spot where Gilford is going to be that quality force of disruption versus those games where you should just discard, except to say don’t summon him if you don’t already have a decent army on the board.