Sengir, the Dark Baron Sengir, the Dark Baron does the vampire thing of preying on those that are killed, and it is good to get two counters, though on a 6-cost creature is simply harder to use
These tournaments became more than just battles between decks
Particularly, Rebels can tutor the Entity onto the battlefield, Atzocan Seer can retrieve it from the graveyard, Slivers buff it, Flamekin Harbinger and Treefolk Harbinger find it for 1 mana, the three Ixalan Forerunners all tutor it up and leave behind a not-irrelevant body, Imperial Lancer is a 1-drop double striker, and there are a few other miscellaneous interactions I tried out
It gets even better if you can reuse its "create a 3/3 Golem" enters-the-battlefield trigger by blinking it a few times
Not only is it always Negate-proof, it - by itself - realizes the main focus of my Dragon deck