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Obelisk of Urd isn't really exciting when it hits only one creature, but +2/+2 is a sizable bonus, and even a few creatures receiving the bonus is enough for it to matter

You can only use this effect of "Refrain the Melodious Songstress" once per turn

Urza's Saga This is a land

Timetwister is unique among the Power Nine in that its effect has been matched in cost and effectiveness by similar cards in the years since

If Valley Questcaller enters at the same time as one or more other Rabbits, Bats, Birds, and/or Mice you control, its first ability will trigger

Cards like Volrath's Laboratory also give you choices to make but are more open-ended