When you cast Pair o' Dice Lost, you roll two six-sided dice, returning cards from your graveyard back to your hand as long as the total mana value of all the cards you picked is less than or equal to your dice roll
It comes in at only two mana but can become a copy of any creature you own, assuming you exile it, so while they are only two mana, you generally want to wait to cast them until you have something big in play, like Massacre Wurm or Crabomination
In fact, most, if not all players will have tendencies toward two categories, and possibly all three
But wait, theres more: you can also discard any number of cards from your hand and draw that many new ones
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Its not a complicated concept by any means, especially as Magic starts using batching mechanics like this more frequently