Getting a free spell with the first creature lets you go way over the top of your opponents, especially once your Ghalta, Stampede Tyrant discovers into Gishath, Sun's Avatar
On your next turn (the extra one), just repeat the process: play Walk the Aeons, sacrifice the three islands to bounce it back to your hand, then play the islands out of your graveyard
Kindred Summons is kind of absurd because of how powerful it is
"Kicker [cost]" means "You may pay an additional [cost] as you cast this spell." If a spell's kicker cost was paid, the spell is "kicked." The kicker ability doesn't let you pay a kicker cost more than once
Five of the six cards here are Rares, which means they won't show up as often, but Thrum of the Vestige is notably an Uncommon
What set is Two-Handed Axe // Sweeping Cleave from