Captain Sisay Competitive EDH (EDH / Commander)

Combo Lines

Infinite damage
Hope of Ghirapur + Blasting Station + Bow of Nylea
(with Sisay and Engine out)

Sac Hope to Station, ping opponent. Tap Bow to put Hope on bottom of library. Tap Sisay to find Hope and cast, untap Sisay, Bow, Station, and mana rocks. Repeat until all opponents dead.

Infinite ETBs/draw/mana
Saffi Eriksdotter + Bow of Nylea + Reki, History of Kamigawa/Mana Rocks
(with Sisay and Engine out)

Sac Saffi, tap Bow to put on bottom of library. Tap Sisay to find Saffi and cast, untap Sisay, Bow, and mana rocks. If enough mana rocks, create infinite mana. If Reki on battlefield draw until combo.

Infinite ETBs/draw/mana Pt. 2
Cheap creature + Cloudstone Curio +Reki, History of Kamigawa/Mana Rocks
(with Sisay and Engine out)

Same as before, using Curio. Fetch curio with Inventor’s Fair after setting up opening line. With curio out, play any cheap creatures and make infinite mana and draw into combo with Reki.

Mill out opponents
Selvala, Explorer Returned + Thousand Year Elixir + Green Sun’s Zenith/Survival of the Fittest + Ulamog, the Infinite Gyre
(with Sisay and Engine out)

With Selvala and Elixir you can draw out entire library. When all cards are drawn, use Zenith and one green source to use it infinitely, failing to find, and drawing out each opponent’s deck. Works the same with Survival of the Fittest and Ulamog, the Infinite Gyre, infinitely discard/shuffling back in.
Also. . . with Survival and Ulamog, if there’s infinite mana, you can cast/sac to Blasting Station to clear any permanents and ping infinitely

Plan B Combos

Infinite Mana
Basalt Monolith + Rings of Brighthearth + 2 mana

Announce the activation of the Monolith's untap ability, tapping the Monolith itself to pay for that ability. That ability goes on the stack and triggers the Rings of Brighthearth. When the Rings trigger resolves, you may pay 2 (from some other source) and copy the untap ability. After the first untap ability resolves, you tap Monolith for 3, then the second untap ability resolves. You now have 3 and an untapped Monolith. Repeat ad nauseum.

And…
Selvala, Heart of The Wilds/Voyaging Satyr and Gaea’s Cradle + Umbral Mantle/Staff of Domination

If there’s a creature with high enough power on the battlefield, tap and untap Selvala with Mantle or Staff infinitely.

And…
Gaea's Cradle + Deserted Temple + Rings of Brighthearth + any 4 creatures =
Infinite Mana
Copy the untap ability of Deserted Temple with Rings to untap itself and Gaea's Cradle and have a net gain of 1 for each fresh tap.

Destroy all opponents’ lands
Elesh Norn, Grand Cenobite + Kamahl, Fist of Krosa

At cost of one green mana, destroy any land an opponent controls

Other Value
Green Sun’s Zenith + Dryad Arbor

Early-game ramp

Survival of the Fittest + Ulamog, Ceaseless Hunger

Return graveyard/any needed cards to library to later be tutored

Crucible of Worlds + Azusa, Lost But Seeking/Exploration + Strip Mine/Fetchlands

Fast ramp and fast land destruction