Teysa Karlov One of the best aristocrat commanders, Teysa Karlov doubles up on any of your death triggers, no matter which player caused them to trigger
Here's a list along with approximate preorder pricing: Call the Spirit Dragons ($20) Dracogenesis ($20) Stormscale Scion ($20) Teval, Arbiter of Virtue ($10) Shiko, Paragon of the Way ($10) Betor, Kin to All ($10) Neriv, Heart of the Storm ($8) Urnei, the Song Unending ($8) Tarkir: Dragonstorm is filled with many powerful Dragons and Dragon cards worth more than the price of a Play Booster (at least during prerelease)
These dinosaurs can be unique because some synergize with others of the same species while others like to play by their own rules and don't need many other companions
Real quick, there is Jolly Gerbils as a one-off reward and incentive to give the most gifts
If he doesn't become one of the best Voltron commanders and justify his massive price, I'll eat my black mage hat
If the returned creature can't attack for any reason (such as being tapped or having come under your control that turn), then it doesn't attack
