All 134 Combos with Yenna, Redtooth Regent

Terra, Magical Adept // Esper Terra + Yenna, Redtooth Regent

Infinite Mana: Infinite LTB, Infinite ETB, Infinite colored mana, Infinite sacrifice triggers, Infinite death triggers, Draw the game, Infinite creature tokens with haste, Infinite creature copies of nonlegendary enchantments you control with haste

Activate Yenna by paying {2} and tapping it, creating a nonlegendary token copy of Esper Terra. When the Esper Terra token enters the battlefield, its first chapter ability triggers, creating a token copy of itself with haste and four lore counters on it. When the new Esper Terra token enters the battlefield, its first, second, third and fourth chapter abilities trigger. Resolve the first and second trigger, creating token copies of any nonlegendary enchantment you control. Resolve the fourth trigger, causing you to add {W}{W}{U}{U}{B}{B}{R}{R}{G}{G} and exile the Esper Terra token. Resolve the third trigger, creating a token copy of the Esper Terra token created in step 1 with haste and four lore counters on it. Repeat from step 3.