At a cost of seven Ink, it isnt cheap to play, but if you have a character that costs seven or more on the field, you can tap it to play Be Prepared without paying its Ink cost
Then the kicker is when you combine mana dorks and other activated abilities for the extra combat
Rammas Echor, Ancient Shield feels surgically pointed at defender decks, from Treefolk to Arcades
Your creatures just might need a new keyword: indestructible
Then Genji Glove costs five, equips for three, and then gives it double strike for TWO triggers and then an attack to give it a free Relentless Assault this turn
Once Tergrids in play, cards like Fleshbag Marauder and Plaguecrafter can help you develop a board presence, while cards like Pox and Dark Deal practically win you the game thanks to Tergrid's amazing sacrifice and discard payoffs