Summon: Leviathan: Leviathan is pretty bomby, especially if you make it semi-one sided with Sahagin or Ultros, Obnoxious Octopus
Sivitri has three abilities, and you can use them for your own protection, to tutor for dragon creatures, or to destroy all non-dragon creatures
If all that sounds too niche, remember you can play Metamorphic Alteration on opposing creatures to make them worse, copying a 1/1 token or whatever else is lying around
Some sets include a VSTAR token instead of a card, which can be used instead
Interaction Ive got some interaction slots here, with lands that can give a creature trample like Skarrg, the Rage Pits, to help a big Ape or Monkey punch through blockers
It might be fine to only play with four or five sources of black mana in your deck