Time Sieve | Mycosynth Lattice | Helm of the Host

(and one other card)

At the beginning of your combat phase,
Helm of the Host triggers, creating a nonlegendary token copy of
Phylath with haste.
When the
Phylath token enters the battlefield, its first ability triggers, creating at least four 0/1 Plant creature tokens.
Activate
Time Sieve by tapping it, sacrificing the
Phylath token and the Plant tokens, causing you to take an extra turn after this one.
Repeat each turn.