Turn two gets you three Goblins, turn three gets you five, turn four gets you seven, and so on
Cascade Spells Ardent Plea Bituminous Blast Bloodbraid Elf Captured Sunlight Demonic Dread Deny Reality Enigma Sphinx Enlisted Wurm Kathari Remnant Maelstrom Nexus Stormcaller's Boon Violent Outburst Besides Bloodbraid Elf being the end-all of Standard for a season, people haven't done very much with Cascade besides finding cards from the Ancestral Vision cycle
There's not really any extra strong interaction between Choco and Keeper of the Nine Gales, but Choco wants to be attacking with as many birds as possible, so the basic synergy holds
2 Machamp V: Astral Radiance (Alternate Full Art) $127.47 A Day In The Life Of The Champ Machamp V made a name for itself as one of the most unusual depictions of Machamp we've ever seen in the Pokemon TCG, though it's an incredible choice, nonetheless
Gum-Gum Giant is different though.\ Used mostly in OP09 Black Purple Luffy, this card will be an excellent defensive tool for blocking attacks, all while drawing a bit deeper into your deck