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Given how easy it is to create the Darkstar token and that it doesnt cost any additional mana, Rufus Shinra is a great card for giving you continual fodder for your sacrifice outlets, but also just for good board presence
Effects that modify a creature's power and/or toughness without setting it will apply to creatures you control no matter when they started to take effect
Honorable Mentions with Narrower Uses Slim Pickins
This is a powerful means of ramping and helping to stay afloat, all while remaining in the good graces of the table
Harmonize [cost] means You may cast this card from your graveyard by paying [cost] and tapping up to one untapped creature you control rather than paying this spells mana cost, If you cast this spell using its harmonize ability, its total cost is reduced by an amount of generic mana equal to the tapped creatures power, and If the harmonize cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack. Casting a spell using its harmonize ability follows the rules for paying alternative costs in rules 601.2b and 601.2fh