Regal Force : Squirrel tokens seem to materialize from thin air in a good tribal deck, and with Toski in play every time one of your creatures deals combat damage to your opponent(s) you draw a card
Library might be worthwhile as a backup plan when you're stuck without a Contract, but it's dead and unnecessary often enough that I chose to skip it
Territorial Aetherkite is one of the best energy cards in Commander
Obviously, while we glossed over it a moment ago, eight mana isnt an insignificant cost to play
However, if a single creature with lifelink deals combat damage to multiple creatures, players, and/or planeswalkers at the same time (perhaps because it has trample or was blocked by more than one creature), the ability will trigger only once
The game was designed to be easy to learn for TCG newcomers while still offering strategic depth for experienced players