Time Sieve | Mycosynth Lattice | Rionya, Fire Dancer

(and one other card)

At the beginning of your combat phase,
Rionya triggers, creating at least one token copy of
Phylath with haste.
Put the
Phylath token into your graveyard due to the legend rule.
The
Phylath token enters-the-battlefield ability triggers, creating at least five 0/1 Plant creature tokens.
Activate
Time Sieve by tapping it and sacrificing the Plant tokens, causing you to take an extra turn after this one.
Repeat each turn.