Low cost characters that allow you to draw a card under certain conditions such as Chernabog's Followers - Creatures of Evil, Magic Broom - Illuminary Keeper, and now Diablo, Obedient Raven are healthy options for replenishing your hand, and quick and cost-efficient bounce targets for all the higher-cost amethyst cards that need a bounce target
The singer 3 ability is quite strong, and a similar card (Ariel) had a lot of success in The First Chapter format of Disney Lorcana
One blue mana at the end step means you draw your pick immediately
It could be to pay for a different cards cost like Abandon Hope , because a spell requires you to, or to reduce your hand back to its maximum hand size
The one downside, albeit small, is that Dragons Rage Channeler is much more aggro-orientated than other threats that are usually played in tempo decks
Rabbit Battery