You’ve got a lot to do here. First, you need to get enough power on the table to overwhelm the twins’ life total. Then you need to find a way past their blockers. But before you make those moves, there’s the problem of a low mana count to deal with. Fortunately for you, you’ve got a Doubling Cube that’s just waiting to be used.
- Tap five forests to add
(all used as generic mana), one island to add 
, and one mountain to add 
to your mana pool. Shizuko, Caller of Autumn added to your mana pool (used as generic mana) at the beginning of your upkeep this turn, so you have a total of - Spend to activate Doubling Cube with in your mana pool. This doubles to .
- Tap your 5/5 Duplicant and Clock of Omens to activate Clock of Omens’ ability. Choose to untap your Doubling Cube.
- Spend to activate Doubling Cube with in your mana pool. This doubles to .
- Spend and pay 3 life for the Flashback cost for Deep Analysis in your graveyard. Dragon-Style Twins gets +1/+1 and is now 4/4. You are now at 8 life with remaining in your mana pool.
- Spend to cast Twincast on Deep Analysis. Dragon-Style Twins gets +1/+1 and is now 5/5. You now have remaining in your mana pool.
- Draw four cards in total from Deep Analysis and its copy: Goblin War Drums, Chronostutter, Hidetsugu’s Second Rite, and Twinflame.
- Spend to cast Goblin War Drums. Dragon-Style Twins gets +1/+1 and is now 6/6. You now have remaining in your mana pool.
- Spend to cast Twinflame on two targets: Dragon-Style Twins and Duplicant. Dragon-Style Twins gets +1/+1 and is now 7/7. You now have remaining in your mana pool.
- When the Duplicant token enters the battlefield, choose to exile Engulfing Slagwurm. Your Duplicant token enters the battlefield as a 7/7 creature.
- Spend to cast Chronostutter on the Primordial Hydra. Your Dragon-Style Twins each get +1/+1 and are now 8/8 and 4/4. You now have remaining in your mana pool.
- Declare the start of your combat phase, assigning both of your Dragon-Style Twins (8/8 and 4/4) and your 7/7 Duplicant to attack. Your mana pool does not empty at the start of your combat phase due to Upwelling, so you still have remaining in your mana pool.
- With only one untapped creature, Raffaela and Renata are unable to block any of your creatures due to Goblin War Drums. The Dragon-Style Twins deal 16 and 8 damage respectively, due to their double strike ability. Duplicant deals 7 damage, for a total of 31 damage dealt during your combat phase. Raffaela and Renata are now at 10 life.
- On your second main phase, spend to cast Hidetsugu’s Second Rite. Raffaela and Renata are at exactly 10 life, so the Rite deals 10 damage to them, defeating the twins.
