The most fearsome of all is Necrozma who can harness the power of both the sun and the moon, to transform into an even more powerful state
Indominus Rex, Alpha likes it both on the battlefield to sacrifice creatures before you bring out your massive dinosaur and in-hand to discard as part of its enters trigger
Keep backup plans ready, such as additional Pokmon that can quickly reapply Sleep or Trainers that disrupt the opponent
And then theres random cards that just happen to care about time counters as well
Example: An ability reads, All artifacts are 1/1 artifact creatures. If a permanent is both an artifact and an enchantment, it will become an artifact enchantment creature. Rule 205.1b., for instance, explains that if you animate an artifact using Tezzeret, Agent of Bolass second ability, it will retain all of its prior sypertypes, types and subtypes