As with any good Goblin-related card, the flavor text is brilliant and amusingly derisive toward Gobbos: Theyre not worth much, but theyre easy to catch. 4
If you want to kill through combat damage, you can turn Volrath into either Cultivator of Blades or Wild Beastmaster and give all your other creatures +7/+7 when attacking, or go for an infect kill by turning Volrath into Jodah's Avenger, using its ability to give him double strike, but before the ability resolves turn into Blighted Agent to attack as a 6/4 unblockable infect double strike one-shot
Clump shuffle/Overhand shuffle/Block shuffle/Hindu shuffle: There are a variety of similar shuffles that fall under these names, but they all consist of dividing your deck into a few piles, then putting those piles on top of each other
The targeted monster can then attack another one of its owner's monsters, or attack them directly, and the player who used Change of Heart can also use that monster's effect if possible
It can synergize with other warriors if you have them, but theyre not a supported type, so it wont happen too often
Enter Modern Horizons 3, which ratcheted the complexity up a notch, making an already complicated mechanic even more difficult to parse out
