Breaching Dragonstorm + Mortuary + Mana Echoes + Phyrexian Altar

Breaching Dragonstorm

Mortuary

Mana Echoes

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing a nontoken Dragon with mana value 8 or less, adding .
2. When the Dragon dies, Mortuary triggers, putting the Dragon from your graveyard onto the top of your library.
3. Cast Breaching Dragonstorm by paying 4.
4. When Breaching Dragonstorm enters the battlefield, its first ability triggers, causing you to exile the Dragon from the top of your library and cast it without paying its mana cost.
5. When the Dragon enters the battlefield, Breaching Dragonstorm's second ability and Mana Echoes trigger.
6. Resolve the Breaching Dragonstorm trigger, returning it from the battlefield to your hand.
7. Resolve the Mana Echoes trigger, adding C for each Dragon you control.
8. Repeat.