Why is Merlin Rabbit good?

I keep seeing Merlin Rabbit in decklists, supposedly because he’s good. I just don’t understand his value. He’s uninkable and costs four ink. Every time I play him, I feel like I’m losing a turn. Could you explain why Merlin Rabbit is considered so good?

I keep seeing Merlin Rabbit in decklists, supposedly because he’s good. I just don’t understand his value. He’s uninkable and costs four ink. Every time I play him, I feel like I’m losing a turn. Could you explain why Merlin Rabbit is considered so good?