As for those dinos, they're the perfect MTG creature type for 'Timmys' - players who like to summon big creatures and wallop their opponent
Or, in other words, youre adding four mana to the cost of one of your spells to fix your mana for that spell
Put those creature cards onto the battlefield, then shuffle the rest into your library
If a player does, counter Temporal Extortion
If you activated this card while your opponent controlled no cards, for the rest of this turn you cannot activate cards, or the effects of cards, with the same original name as that banished card
However, as these are some of the most rare cards of each set, this can be rather time-consuming and unreliable