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Baylen, the Haymaker Turning tokens into fuel, Baylen, the Haymaker gives you mana, cards, or big trample swings just by tapping your creatures
Further up the curve is not so much of a problem, they will probably come down a turn slower but the double costs in the four and five slots shouldn't pose too many casting issues
Others may create tokens, like a tapped 1/1 blue Fish token from Parting Gust, or a Food token, as seen on Valley Rally
Witch-king of Angmar Witch-king of Angmar will make it so that your opponents wont want to attack you, unless they have a big and wide creature army