According to the rules the process of casting creature cards (or any other non-land cards) consists of the following stages: you put a creature card on the stack, define its total casting cost and it locks in, then you get a chance to activate mana abilities (but only if the total cost requires mana), and, finally, you pay the cost
Magic: The Gathering is generally one of the more expensive trading card games, but it depends how you play
Any "as [this creature] enters" or "[this creature] enters with" abilities of the creature will also work.
If you want to improve the deck further and have the budget to do so, Arthur - Wizard's Apprentice is a very good card in an aggressive bounce deck
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The ability to do this at instant speed is really powerful, and it being on a Land makes it easy to rely on in a pinch too