Using your Junk monsters to swarm the field, you can summon powerful Synchro monsters!
If things look bad use the Mystical Tomato monster to summon Yubel! If you control a Goyo Synchro monster then you can steal your opponents monsters to use as tributes for Yubel, but The Mound of the Creator could work as a substitute if you can't tribute any monsters, if that's on the field your Yubel cannot destroy itself, but that could work as a double sided sword. Dark Hole and Emergency Evacuation Device can remove any form of Yubel from the field, then you can summon the next form of Yubel!
The Elemental HERO fusions can come in handy if you need powerful, easy to summon monsters, Elemental HERO Absolute Zero can be used if you need to clear your opponents monsters out!