The one downside is that only Ally cards can be returned to the top
Tinybones is a member of an unofficial cycle of legendary creatures that can hit your opponents for 10 life at a time, alongside Lathril, Blade of the Elves
Like creatures and enchantments, they hang around on the field after being cast, can have static, triggered, or activated abilities, and tend to die to removal
Its hard for opponents to deal with the cascade trigger, so a cascade card is sort of like getting two cards for the cost of one
Lifelink (Damage dealt by this creature also causes you to gain that much life.) As long as you have 30 or more life, this creature gets +5/+5 and has flying
Compared to a lot of other threats in the cube it is not great value for mana, you are paying a lot for it being both a threat itself as well as an equipment in addition to the bounce