Time Warp - (Mage) 5 mana, gain 1 mana crystal and 1 card, trigger all turn-based effects.
This type of spell interacts with minions with effects that take place either at the beginning or end of a turn. Imp Master summons an Imp, Micro Machine gains +1 attack, Shade of Naxxramas gains +1/+1, Ysera draws a card, Ragnaros deals damage to a random enemy, etc. Other variants would be:
Whip Peon - (Warrior) 2 mana, deal 1 damage to a minion; they immediately trigger their turn-based effect.
Hibernate - (Druid) 2 mana, enemy minions no longer trigger their turn-based effects on your opponent's next turn (it overrides the previous two)