Invasion of Segovia // Caetus, Sea Tyrant of Segovia + Ovika, Enigma Goliath Combos

2 known combos featuring both cards in Commander

Infinite ETB Infinite storm count Infinite tapped creature tokens Exile your library Infinite self-mill

Combo 1 with Cloudstone Curio

Also requires: Cloudstone Curio Cloudstone Curio
Results: Infinite ETB · Infinite storm count · Infinite tapped creature tokens
Steps
  1. Cast the card from your hand by paying its mana cost reduced by the number of other creatures you tap as you cast it.
  2. Ovika triggers, creating a number of 1/1 Phyrexian Goblin creature tokens with haste equal to that spell's mana value.
  3. When the Phyrexian Goblins enter the battlefield, Cloudstone Curio triggers that many times.
  4. Resolve all Cloudstone Curio triggers, choosing not to return anything to your hand from the battlefield.
  5. Resolve the permanent spell cast in step 1.
  6. When the permanent enters the battlefield, Cloudstone Curio triggers, returning another nontoken, noncreature, nonartifact permanent that shares a type with the permanent that entered the battlefield to your hand from the battlefield.
  7. Repeat.

Combo 2 with Sweet Oblivion + Phyrexian Altar

Results: Exile your library · Infinite self-mill · Near-infinite death triggers · Near-infinite ETB · Near-infinite LTB · Near-infinite magecraft triggers · Near-infinite sacrifice triggers · Near-infinite storm count
Show steps
  1. Cast Sweet Oblivion by paying {1}{U} reduced by the number of creatures you tap as you cast it, targeting yourself.
  2. Ovika triggers, creating two 1/1 Phyrexian Goblin creature tokens.
  3. Resolve Sweet Oblivion, causing you to mill four cards.
  4. Cast Sweet Oblivion from your graveyard for its escape cost by tapping the two Phyrexian Goblins, and paying {1}{U} reduced by the number of other creatures you tap as you cast it, as well as exiling four other cards from your graveyard, targeting yourself.
  5. Ovika triggers, creating two 1/1 Phyrexian Goblin creature tokens.
  6. Activate Phyrexian Altar by sacrificing the two tapped Phyrexian Goblins, adding {1}{U}.
  7. Resolve Sweet Oblivion, causing you to mill four cards.
  8. Repeat from step 4.
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