Mace of the Valiant [Throne of Eldraine] Human Tyranid Scout you may play cards exiled

you may play cards exiled with The Temporal Anchor

and they have a host of ways to deter them

Set: Kaldheim Type: Snow Creature — Troll Warrior Rarity: Common Cost: {2}{G} {S}{S}: Icehide Troll gets +2/+0 and gains indestructible until end of turn

Set: March of the Machine Commander Type: Artifact — Equipment Rarity: Uncommon Cost: {1} Equipped creature gets +1/-1

Mace of the Valiant [Throne of Eldraine] Human Tyranid Scout you may play cards exiledSet: Throne of Eldraine Type: Artifact Equipment Rarity: Rare Cost: {2}{W} Equipped creature gets +1 +1 for each charge counter on Mace of the Valiant and has vigilance. Whenever a creature enters the battlefield under your control, put a charge counter on Mace of the Valiant. Equip {3}