Hello, I am Pelitin, a Hearthstone player since beta who has reached legend several times. I have always favored a tempo play style with some of my favorite decks being Tempo Rogue, Tempo Mage and Midrange Druid. With Tempo Rogue not being viable for over a year now, I was really looking forward to Unearthed Raptor as a card that might revive the archetype and so far I have been very pleasantly surprised by the results. I reached legend rank with this deck in season 20 and am planning to keep laddering with it and refining it on this upcoming season as well.
Proof of legend:
Your plan with this deck is to flood the board with hard-to-remove deathrattle minions and kill your opponent before he can stabilize the board. It is very difficult to come back with this deck if you fall behind early so it is extremely important to gain control of the board during the first few turns. Early game you should be focusing on making favorable trades to maintain board control until you are in a good enough position to start prioritizing the face.
Backstab - One of the best tempo swing cards in the game and a pretty obvious inclusion. Cheap removal which allows to establish early board control as well as enable combos later in the game.
Cold Blood - A good activator for Nerubian Egg. Works well for trading on the turn played, but can also be use to go face with a deathrattle minion the opponent would normally not trade into like the Nerubian Egg to force the opponent to deal with the target minion on their turn (remember to watch out for silences when played like this). Also adds some reach which is something the deck would otherwise lack.
Abusive Sergeant - Second activator for Nerubian Egg. Best used early to trade with deathrattle minions. Can also be just played on curve in the early game without making that good of a use out of the battlecry.
Eviscerate - A strong spell for fighting for board control as well as the main reach in the deck.
Sap - Another strong tempo card best used on 5+ mana taunts or other expensive minions to set up for a lethal for the next few turns.
Loot Hoarder - Some draw and a decent deathrattle.
SI:7 Agent - An incredibly strong tempo minion in aggro match-ups when comboed.
Unearthed Raptor - The core of the deck. Aim to copy a strong deathrattle but don't be too afraid to play even with no targets if you have to.
Piloted Shredder - Best 4 drop in the game and a great deathrattle, not much to say here.
Azure Drake - Adds a little bit of card draw.
Leeroy Jenkins - Great finisher.
Loatheb - Lets you flood the board and avoid board clears for a turn allowing you to push for lethal on the following turn.
Sludge Belcher - Strong 5 drop with a deathrattle.
Dr. Boom - Dr. 7
Other cards to consider
Sylvanas Windrunner - I ran Sylvanas when I first made the list, but I quickly noticed the card is too slow for this deck. The thing is if this deck falls behind on the board a single Sylvanas Windrunner is not going to help regain it and comboing it with an Unearthed Raptor is a 9 mana combo and something I never did in the ~30 games I played with the card. Nearly every game where I played Sylvanas Windrunner it ended up being just an overcosted 5/5 which is something I wouldn't personally run in this deck.