Tellah, Great Sage is a little vulnerable to removal since its only a 3/3, but untap with this in a good spells deck and I cant imagine youd lose very often
It does what it needs to do very well, and being able to only leave one mana up and destroy any creature is something that most decks can do comfortably
Willpower: Willpower is a number inside a shield on the right side of the card, and it tells you how much damage a card can take before its banished (removed from the game)
This one is also pretty simple: once youve collected four copies of a common or uncommon card, each extra one that you get will go into the Vault
The Eldrazi The Eldrazi, especially Emrakul, the Aeons Torn, carry a certain kind of fear and weight with their name
Even aside from the more general application of the cards I mentioned today, theres a bunch of great cards for more particular archetypes available too