Not only do they help your mana base, but you can also build around them with a variety of payoffs and clever synergies
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#9 I think that there's an alternate direction to take this: Obviously, they're at different power level, but the idea is simple
(Until your next turn, those creatures attack each combat if able and attack a player other than you if able.) If, during a player's declare attackers step, a creature that player controls that's been goaded is tapped, is affected by a spell or ability that says it can't attack, or hasn't been under that player's control continuously since the turn began (and doesn't have haste), then it doesn't attack
Tiamat, the Queen of Dragons It wouldnt be a Dungeons & Dragons set without dragons, and Wizards decided that Tiamat was the perfect dragon to include