Terra facilitates this by paying two mana to resurrect a creature with three or fewer power whenever she deals combat damage to a player
Whenever Etrata deals combat damage to a player, exile target creature that player controls and put a hit counter on that card
Rin and Seri's first two abilities don't trigger when you cast Rin and Seri
If you want to get more convoluted, you can add a Panharmonicon to the mix: Restoration Angel can flicker another creature at the same time, and Felidar Guardian can flicker a land in addition to the Angel, resulting in infinite mana as well
If this Set card in its owner's control has left the field by an opponent's effect, and is now in the GY or banished: You can Special Summon this card as an Effect Monster (Fiend/DARK/Level 10/ATK 4000/DEF 4000) with the following effect (this card is NOT treated as a Trap)
The 3-mana enchantment already does work, but squad scales it with the game