Zinnia, Valley's Voice | Cloudstone Curio | Ashnod's Altar

(and one other card)

Cast
Crookshank Kobolds by paying ({0} magic symbol) , plus an additional ({2} magic symbol) for its offspring cost.
When
Crookshank Kobolds enters the battlefield, it and
Cloudstone Curio trigger.
Resolve the
Cloudstone Curio trigger, returning nothing from the battlefield to your hand.
Resolve the
Crookshank Kobolds trigger, creating a token copy of it that is 1/1.
When the
Crookshank Kobolds token enters the battlefield,
Cloudstone Curio triggers, returning the nontoken
Crookshank Kobolds from the battlefield to your hand.
Activate
Ashnod's Altar by sacrificing the token
Crookshank Kobolds, adding ({C} magic symbol) ({C} magic symbol) .
Repeat.