Hearthstone

Microtransactions in Hearthstone are summarized as...

Hearthstone is expensive to get in to. While at it's core the game is completely free, you are put at a severe disadvantage compared to players who do pay or have been playing for a long time. You're missing out on large parts of the game if you do not own the correct cards. You can obtain all cards without every paying, but that requires you to play the game for a very large amount of time. New expansions release regularly, with this some of your cards might become irrelevant. Either because they are no longer as strong, or because they are straight up taken out of the main game. Cards of some modes are not compatible with cards in other modes, requiring you to collect more and more cards.

Cards are not the only thing you can purchase. There are more cosmetics available. For example different card backs or different hero appearances. Some of these can be earned for free, but often only during a limited amount of times. Others need to be purchased, often not directly but through bundles.

There's also several single-player adventure modes available that require a purchase to enter. Purchasing all of these will cost you over 150 USD.

Some modes require a purchase every time you play, but can be purchased with in-game earned currencies as well.

The game isn't strictly pay-to-win, but if you are a new player and you don't want to spend any money you're going to have a rough time.

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Contains "Gacha" mechanics. Certain non-cosmetic items are only obtainable via lootbox like mechanics. These items affect gameplay.

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Contains items that only come in bundles and can not be acquired on their own.

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Rewards in-game items for external purchases (e.g. Twitch Prime subscriptions).

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Includes mechanics that are intentionally slow or inconvenient, but can be bypassed with real money purchases.

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Battle Passes are timed exclusives. If you don't finish it in a given time you do not get what you paid for.

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In-game items that are obtainable with real money are frequently made irrelevant by new updates to the game.

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Contains an unreasonably large amount of optional DLC, costing an extraordinarily high amount in total.

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Contains one or multiple Battle Passes.

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Features unique cosmetic rewards for pre-ordering the game.

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Free to play. Requires no up front payment.

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All in-game items can be purchased with in-game currencies and do not require real life money.