Rather than pay mana for them, youll want to send them directly from your hand to the graveyard and then have them enter play via their abilities
The vast majority of monster effects in Rush Duel are Ignition Effects
Following the same principle, you can adjust your land count based on the number of cost-effective mana-producing creatures in your deck like Llanowar Elves, or cards that help you retrieve lands like Many Partings, which essentially functions as having an extra land in hand
Remember that if its too good to be true, it probably is
Green Baboon, Defender of the Forest is a character version of the card, "Green Baboon, Defender of the Forest"
I don't have a list of names that get you this, unfortunately