Lets take a look at each levels power: Level One In a flavor win, you want your Ring-bearer to be small with low power in order to sneak past blockers, which has Halflings written all over it
Raksha Golden Cub [Cat]: In late-game commander, this will boost your army by a lot
You can, for instance, transform Mimeoplasm into Invisible Stalker to make it unblockable, attack, then transform it into Terisian Mindbreaker to give it some extra, half-the-deck-milling oomph as it slams into your opponent, then transform it into Seedborn Muse to untap it, then transform it into Ulamogs Dreadsire to pop out a 10/10 for giggles
It can be overwhelming
Flanking means "Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn." If a creature gains flanking during combat, that has no effect on any creature already blocking it
I fully expected Lord of the Rings to be more mainstream than Dungeons and Dragons and the data supports this hypothesis