The Verdict Although I havent played with any of the decks myself, Breed Lethality seems to be the most powerful and most consistent of the five precons
Where this card goes up in potential is in decks that already want to be attacking plenty, as the unblockable itll gain on activation can really help certain strategies pop off
Still, this effect is a welcome addition to Standard
Notice that both of these abilities only need one card under to work
However extra turns goes against the casual philosophy of "time equity" in a multiplayer game -- it's bad manners to take up all the game time hogging all the turns while you slowly tick up and down your walkers
It's that last deck that piques our interest the most, but Wizards has gotten so, so good at making precons lately, so we wouldn't be surprised if all four are powerful and fun contenders