Creatures that can deal damage to opponents, boost attacking creatures or make crature tokens, such as Valakut Invoker, Orthion, Hero of Lavabrink, Walking Ballista, and Rhonas the Indomitable
For many of the most powerful cards in the game, their power level is balanced out by being extremely expensive to cast (meaning you cant cast them until the late-game), or forcing players to make another big sacrifice to bring it into play
You keep energy counters until you pay them or something causes you to lose the counters
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I think Wizards got a lot right here, building Karador for the long game with their ability to reduce their cost and by extension, commander tax and restricting the reanimation ability to once per turn
One mana is a steal, however, as shown by cards like Blasphemous Act