White Catch-up Ramp White has gotten a lot of catch-up mechanics in recent years, with catch-up ramp being one of the most impactful
This one uses Golgari cards from Return to Ravnica
Trading away bad cards for fresh ones gives you a significant advantage, but this has a huge benefit over your average wheel: You choose which cards to keep and which to ditch
A lot of balance and care goes into choosing the cost of a card, more than I can express here, but looking for similar effects on existing Magic cards can give you an idea of a fair costfor example, a ramp spell that puts two lands into play ought to cost 4 mana, per Explosive Vegetation
Banned Ante Cards Ante is an old and optional game mode for Magic that allowed players to compete in matches to permanently gain control of your opponent's cards if you beat them in a match
You can return your own creatures to your hand and then cast them for their mutate cost if you've got the right recursion effects