April is fairly sparse as far as big birthdays go, but we could see Gladiolus Amicitia (Final Fantasy XV) on the 2nd, Gau (Final Fantasy VI) on the 5th, and Ardyn Izunia (Final Fantasy XV) on the 30th
Even so, this is a small price to pay for the ability to instantly remove any one of your opponents Pokemon.
As a 1/1 for one mana that's not too bad, although modern casual decks would want a bigger power from a one-drop to beat like 2/1 with a weakness for the same mana at common Jungle Lion or a 1/1 with a better ability like fellow common Llanowar Elves or Essence Warden
For example, some Japanese promo cards feature special holofoil patterns (like sparkles or textured foiling) not seen on their English counterparts
The size has remained consistent for decades because it creates a comfortable playing experience while allowing cards to fit inside standard accessories
For five mana (one of each color) you can untap all attacking creatures and give them trample, lifelink, and haste and gives you an additional combat phase after that one