Shilgengar, Sire of Famine + Titania's Song

Prerequisites

• You control a permanent that is boosting the toughness of all your creatures by at least 1, or that is giving a creature a +1/+1 counter as it enters the battlefield.
• You control at least one additional creature.

Steps

1. 1Activate Shilgengar's first ability by sacrificing another creature, creating a Blood token.
2. 2The Blood token enters the battlefield as a 0/0 creature due to March of the Machines, and will have its toughness boosted by the permanent specified in the pre-requisites to prevent it from dying.
3. 3Repeat.

Effects

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers