Servants of the Tyrant

Strategy
Servants of the Tyrant usually summons a 5/5 with Flying, which can be threatening if your opponent doesn't have an answer to a big flying unit. However, if your deck is nearly depleted, it instead summons three. Three 5/5 Dragons with flying is often enough to seal of a game in a few turns.

Games usually don't reach the point where your deck runs this low on cards though. For this reason it's best to run this card with either Book of Legends or, like the name suggests, Tyrant Dragon, who can swiftly reduce the size of your deck. Servants of the Tyrant works best when you build your deck around it.