Hearthstone's future - New keyword ideas

immune: cannot be debuffed or buffed (but still can take damage normally)

I am so sick of freezing. On the other hand, since it cannot be debuffed it cannot be buffed too… And also cannot be silenced.

Immune minions might introduced a play where a stealth minion with (immune and cannot attack) can stick to the field, and giving a field effect. and introduced a way how players to handle the field other than “trading minions”.

Immune already exists.
Your definition makes the entire word worthless.

never tried buffing it or freezing it but there is a tavern brawl card
mime with th text "always silenced " im guessing this card cant be buffed or debuffed

Evade - once a minion with the evade keyword is played, they can choose between an option of even or odd cards. In the opponents turn if they play a card or attack with a card that has the mana cost picked (say even), it cancels out the minion or spell effect (not like counter spell, as it will allow the user to keep the card, just uses up the mana cost). This effect lasts until the minion with evade leaves the battlefield.

Here’s an example- a mage has a bunch of 3 mana minions on the battlefield, you play a minion with evade and choose odd. Now if the opponent attacks with the 3 mana minions, it’ll get negated to no damage. If the opponent uses flamestrike (7 mana) the mana cost is used with no effect, with the card going back in the opponents’ hand. Blizzard (6 mana) or any card reduced in cost to even cost will work as normal.

It’s a good way to manipulate your opponents turn with big brain plays and avoid board clears or cards you know are coming. Imagine preventing Galakrond for example.