Defender is one of those mechanics that only matter for the combat step, so a 3/3 creature with defender can deal damage by fighting
Players cant lose life this turn and players cant lose the game or win the game this turn. In essence, it stops anyone losing that turn, and also every creature on the board
Eventually, you'll be ready to aim it at your opponents
Then the effect happens again for you a number of times equal to the number of opponents who accepted
13 Belle's House Maurice's Workshop When running an item-based deck, you'll spend most of your ink getting those items on the board
A card that goes great with Zimone is Yedora, Grave Gardener which causes dying creatures to return as face-down Forest lands, triggering Zimone