Grievous Wound's last ability triggers only once whenever enchanted player is dealt combat damage, no matter how many creatures deal combat damage to them at the same time
(Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.) Legendary Creature - Human Rogue Lulu, Loyal Hollyphant Flying At the beginning of your end step, if a permanent you controlled left the battlefield this turn, put a +1/+1 counter on each tapped creature you control, then untap them
There's even a thematically appropriate FF7 version of Heroic Intervention available in a Secret Lair drop
Note that it says "leave the field," meaning this triggers off of blink effects, return to hand, exile, and more
There are certain cards that work well with this strategy like Kalonian Hydra, and hydras in general because theyre usually 0/0 that ETB with +1/+1 counters