Terra, Magical Adept // Esper Terra + Mirrormade

Steps

1. Activate Terra by paying {4}{R}{G} and tapping it, exiling it and returning it to the battlefield as Esper Terra.
2. Esper Terra enters with a lore counter on it, triggering its first chapter ability, creating a token copy of Mirrormade with haste, which will enter as a copy of Esper Terra with haste and with one to four lore counters on it.
3. Put the oldest Esper Terra into your graveyard due to the legend rule.
4. The Spark Double token's chapter abilities will trigger according to how many lore counters were placed on it.
5. Resolve the first Mirrormade token trigger, creating a token copy of Mirrormade with haste, which will enter as a copy of Esper Terra with haste and with one to four lore counters on it.
6. Repeat from step 3.