Requires

Sliver Gravemother must be in the command zone. Intruder Alarm must be on the battlefield. Heart Sliver must be on the battlefield. Gemhide Sliver must be on the battlefield. Mindlash Sliver must be on the battlefield. Sliver Gravemother must be your commander. You have at least three opponents. At most plus two mana of any two different colors available, plus enough mana to pay for commander tax, if applicable.

Steps

1. Activate all Slivers you control by tapping them, adding one mana of any color for each Sliver tapped this way.
2. Cast Sliver Grandmother from the command zone by paying and commander tax, if applicable.
3. When Sliver Grandmother enters the battlefield, Intruder Alarm triggers.
4. Holding priortiy, activate Sliver Gravemother by tapping it, adding one mana of any color.
5. Resolve the Intruder Alarm trigger, untapping all creatures.
6. Activate all Slivers you control by tapping them, adding one mana of any color for each Sliver tapped this way.
7. Activate Sliver Gravemother by paying and sacrificing it.
8. Choose not to return Sliver Gravemother to the command zone from your graveyard.
9. Resolve the Sliver Gravemother ability, causing each player to discard a card.
10. Activate Sliver Gravemother's encore ability by paying and exiling it.
11. Choose to return Sliver Gravemother to the command zone from exile.
12. Resolve the Sliver Gravemother ability, creating a token copy of it for each opponent you have.
13. When the Sliver Gravemother tokens enter the battlefield, Intruder Alarm triggers that many times.
14. Holding priority, activate the Sliver Gravemother tokens by tapping them, adding at least three mana of any color(s).
15. Resolve the first Intruder Alarm trigger, untapping all creatures.
16. Activate all Slivers you control by tapping them, adding one mana of any color for each Sliver tapped this way.
17. Repeat from step 15 for each remaining trigger.
18. Repeat from step 1.

Results