Procrastination is the shield for Time. True to it's element, the shield stops the creature for one turn whenever it attacks. The delay status prevents the opponent's creature from attacking and using skills thus buying you some time to deal with them through cards such as Reverse Time.
Shards of Gratitude is a rare card that can heal you while Procrastination is holding off the opponent's creatures.
Cards that infect your opponent's creatures such as Plague will cause them to lose life while being stunned.
Otyugh can devour creatures while they are being stunned. This is useful against creatures with burrow ability such as Devourers or Shriekers. It can also be used to counter Seraph's Divine shield ability.
- Watch out for targets that are buffed with Adrenaline. These creatures will still hit multiple times, and since Procrastination only affects them attacking once (the stun only affects their normal attacking rate), their extra strikes via Adrenaline will come through.
- Try not to constantly rewind creatures that are already affected by the stun and can be easily played again. By rewinding them, you essentially negate the effect of Turtle Shield and the opponent will replay the creature again. (This will also cause ‘rotating’ damage periods between delayed and non-delayed creatures, which could ruin the long-term effects of halving damage)
- Creatures with Momentum will unfortunately bypass the stun effect. This includes a flying Titan.
- Having other shields besides Procrastination may just add space in your deck (unless you don’t have a way to protect them via Enchant Artifact); unlike other shields that may have time limits (Phase Shield), are luck based (Fog Shield), or can hurt you over an extended period of time (Dissipation Shield), Turtle Shield’s effect is a constant one-turn delay that will work the most consistently out of all shields, which means you don’t want to be replacing the shield with something else every so often if you can afford to. Permafrost Shield may last longer, and reduce all damage by 2, but the freeze is proc-based, and you can't always rely on percentage-based shields against significantly tougher monsters.
- Another fun tactic to use is having a Auburn/Earth Nymph out or Basilisk Blood to freeze really strong creatures for even longer periods of time. Try using it after the delay from the Turtle Shield wears off from their first assault - 7 turns of uselessness will definitely agitate the opponent, and if you throw a rewind on the creature when the stun wears off again, then you'll really be wasting their damage potential immensely.