Tinybones himself is a legendary creature with deathtouch and who, upon dealing combat damage to a player, allows you to cast a nonland permanent from their graveyard, spending mana of any type to cast it, effectively letting you pickpocket their graveyard for whatever spells you want
This will be a negative for decks with payoffs that specifically want you to draw cards, but on the other hand your foes won't be able to target your draws
When you take battle damage: You can Special Summon this card from your hand, and if you do, end the Battle Phase after the Damage Step
So effects that cause you to discard your spells with shroud still work unless the card in question is Quagnoth
Blastoise debuted in Base Set with 100 and stayed at that number throughout the first two generations
Redefining Card Advantage So now that weve looked at the bones, lets try to piece together this card advantage animal for the purpose of building a deck for Commander