Final Fantasy XIV Online
Microtransactions in Final Fantasy XIV Online are summarized as...
FF14 requires quite a lot of purchases. You need to purchase the base game, expansions, and of course a subscription fee. There is a generous trial period available.
FF14 features a real money shop which includes weapons, pets, mounts, etc. These are all cosmetics only. Some of these (especially mounts) can be incredibly expensive. There's a ton of items available, purchasing them all would set you back a few thousand USD.