Enchant creature You control enchanted creature. Enchanted creature gets +1/+1 and has slipstream. (This creature can't be blocked as long as only creatures with slipstream are attacking.)
2021-02-01 — Has been reworked. Originally {1}{U}{U}, "Enchanted creature gets +1/+1 and can't be blocked," and "Concord — {0}: Gain control of enchanted creature for as long as there are four or more card types among permanents you control."