The last one, and my favorite is Krrik, Son of Yawgmoth
Synergistic and value-generating cards that fill out the lower end of the mana curve are some of the most important cards in any Magic deck
Don't rely on lifelink to do the work here, but rather cards like Rhox Faithmender, Resplendent Mentor, Space-Time Anomaly, or Beacon of Immortality
Your toxic game plan can start early with the 1-mana Skrelv, Defector Mite
Lastly, is a substantial amount to pay for an ability each turn, but it guarantees you a card, so more often than not it is worth it
The bolster ability triggers off any of your dragons attacking, so you can stack up counters fast, even if they dont always go where you want them to