The Tarrasque This card let D&D people down because they expected it to be harder to handle
We had cards like One with the Multiverse which makes an interesting impression, or cards like Ghalta, Stampede Tyrant for creatures
Her proliferate ability opens up all kinds of avenues and has only gotten more flexible as Wizards experiments with new types of counters like shield and stun
Great, that can actually be it for today, you dont have to continue, if thats all you had time for
For example, if there are two +1/+1 counters on Aerith Gainsborough and it gets three -1/-1 counters, you'll put two +1/+1 counters on each legendary creature you control when Aerith Gainsborough's third ability resolves
If youve been searching MTG custom card creator or Magic: The Gathering card creator online, this is basically that but built with printing in mind, so the final result doesnt look like it was assembled in a hurry on a phone