pokemon card seaking - (28/162) - XY Breakthrough during your opponents next turn Seaking - Topps Series 2

They fit well into a wraith deck surrounded by removal spells

Seven mana seems like a high cost for an ability until you remember some of the amazing dragon synergies like Goldspan Dragon and Savage Ventmaw

In addition, most of the spells in this set that trigger them tend to be great, including winners like: Thunder Magic Ice Magic Dreams of Laguna (triggers with flashback) Retrieve the Esper Eject Sorceress's Schemes Choco-Comet UR gets to play a ton of good interaction and card advantage, all of which can set up cascading advantages with its value creatures

You draw that many cards whenever you put counters on it

It doesn't get much more streamlined and efficient than this