Myr Battlesphere [Commander 2018] 21a and Link Monster destroyed by

and Link Monster destroyed by this effect

ATK and DEF and that

it gains 600 ATK until the end of the Battle Phase

but your choice if tied)

Set: Urza's Legacy Type: Artifact Rarity: Rare Cost: {2} Each spell costs {3} more to cast except during its controller's turn

Myr Battlesphere [Commander 2018] 21a and Link Monster destroyed bySet: Commander 2018 Type: Artifact Creature Myr Construct Rarity: Rare Cost: {7} When Myr Battlesphere enters the battlefield, create four 1 1 colorless Myr artifact creature tokens. Whenever Myr Battlesphere attacks, you may tap X untapped Myr you control. If you do, Myr Battlesphere gets +X +0 until end of turn and deals X damage to the player or planeswalker it's attacking.