Sine Mono-Green decks generally are creature and combat-focused, this makes Craterhoof Behemoth especially terrifying, as the X values will likely be very high, allowing you to swing out with giant creatures, all that gain trample to likely take anyone, if not the entire group of players out in one combat phase
Tamiyo, Field Researcher Why the best colors in Standard get a powerful card like Tamiyo, Field Researcher added to their inventory Ill never know, but we will all be sick of seeing Tamiyo very soon
You can use it to improve your skills, form new strategies, or you are just interested in creating a card for a certain style
If these activation conditions could have been satisfied after a monster is destroyed by battle, you are not allowed to activate these cards
Credits can also be earned by achieving various milestones within the game
Whenever you attack, if its the first combat phase of the turn, untap all attacking creatures